- Official section
- National IV.B: Types of Loans
- Broker weight
- Part of 10% of the national portion
- Expected scored items
- The current PSI broker outline assigns about 10 of 100 scored national items to Financing
Financing exam concept
Fixed-rate vs. adjustable-rate mortgage
Fixed means the contract rate stays put. Adjustable means a formula can reset it. For an ARM, identify the initial period, adjustment frequency, index, margin, caps, floor, and maximum payment exposure before deciding what happens. The memorized formula is index plus margin, but the tested answer often turns on a cap that prevents the calculated rate from taking effect all at once.
Last updated: August 1, 2026
What is the difference at a glance?
Short answer: A fixed-rate mortgage keeps the note rate constant, which ordinarily stabilizes scheduled principal and interest on a fully amortizing loan. An ARM can hold an initial rate for a stated period and then reset on scheduled dates. The preliminary reset calculation is index plus margin. Apply the initial adjustment cap at the first reset, the periodic cap at later resets, the lifetime cap to the total permitted increase, and any floor to decreases. Then calculate the payment from the adjusted rate, current balance, and remaining amortization period. Taxes, insurance, mortgage insurance, and escrow can change even when the note rate is fixed.
ARM provisions are document-specific. Product notation, index observation, lookback period, rounding, caps, floors, carryover, payment recast, interest-only period, and replacement-index rules can differ. Current conventional uniform instruments use 30-day Average SOFR for certain ARM products, but older loans and other programs can use other indices. Use the stem's facts for exam calculations and the executed note and disclosures for a real loan. Sources cited here were checked through August 1, 2026.
What changes from one term to the next?
- Terms
- Fixed-rate mortgage vs. ARM
- Difference
- A fixed-rate mortgage keeps its contract rate unchanged. An ARM permits rate changes under a stated index, margin, timing, and cap formula.
- Question cue
- Rate certainty versus formula-based resets.
- Terms
- Index vs. margin
- Difference
- The index is the variable market benchmark. The margin is the lender-set contractual number of percentage points added to it.
- Question cue
- Moving benchmark versus fixed add-on.
- Terms
- Fully indexed rate vs. effective rate
- Difference
- The fully indexed rate is index plus margin. The effective reset rate is what remains after caps, floors, and rounding apply.
- Question cue
- Formula result versus permitted charged rate.
- Terms
- Initial rate vs. fully indexed rate
- Difference
- The initial rate applies at closing and may be discounted or otherwise different. The fully indexed rate uses the current index plus margin.
- Question cue
- Starting offer versus formula rate.
- Terms
- Initial cap vs. periodic cap
- Difference
- The initial cap governs the first reset after the fixed period. The periodic cap governs each later adjustment from the previous rate.
- Question cue
- First change versus later changes.
- Terms
- Periodic cap vs. lifetime cap
- Difference
- The periodic cap limits one reset. The lifetime cap limits the total permitted increase over the full loan.
- Question cue
- One step versus overall ceiling.
- Terms
- Rate cap vs. floor
- Difference
- A cap limits upward or interval movement as stated. A floor sets the lowest permitted rate.
- Question cue
- Upper-change protection versus minimum rate.
- Terms
- Rate cap vs. payment cap
- Difference
- A rate cap limits the interest rate change. A payment cap limits payment movement and can permit unpaid interest if the rate cost exceeds the payment.
- Question cue
- Interest limit versus cash-payment limit.
- Terms
- Note rate vs. APR
- Difference
- The note rate calculates contractual interest. APR is a standardized disclosure measure of credit cost using specified fees and assumptions.
- Question cue
- Interest calculation versus comparison disclosure.
- Terms
- Principal-and-interest stability vs. total-payment stability
- Difference
- A fixed fully amortizing loan can stabilize principal and interest. Taxes, insurance, mortgage insurance, and escrow can still alter the total payment.
- Question cue
- Loan component versus full housing bill.
How does the distinction change the answer?
Fully indexed rate without a binding cap
Scenario: At an adjustment, the stated index is 3.80% and the contractual margin is 2.25%. The note's caps do not restrict this reset.
- Add the index and margin.
- 3.80% plus 2.25% equals 6.05%.
- No cap or floor changes the formula result on the facts.
Answer: The new rate is 6.05%, subject to the note's rounding convention if one is stated.
Initial cap controls
Scenario: An ARM begins at 4.00%. At the first reset, index plus margin equals 7.25%, but the initial adjustment cap allows an increase of no more than 2 percentage points.
- The fully indexed rate is 7.25%.
- The first-reset ceiling is 4.00% plus 2.00%, or 6.00%.
- The initial cap prevents the entire formula rate from applying now.
Answer: The permitted first-reset rate is 6.00%.
Periodic cap controls
Scenario: The prior effective ARM rate is 6.00%. At the next annual reset, index plus margin equals 8.40%, and the periodic cap is 1 percentage point.
- The formula produces 8.40%.
- The periodic cap permits only 1 percentage point above the prior 6.00% rate.
- Any lifetime ceiling is assumed not to be lower in this example.
Answer: The new effective rate is capped at 7.00% for this adjustment.
Lifetime cap controls
Scenario: An ARM began at 3.50% and has a 5-percentage-point lifetime increase cap. At a later reset, other caps would permit 9.00%.
- The lifetime ceiling is 3.50% plus 5.00%.
- That produces a maximum rate of 8.50%.
- The lifetime limit overrides the otherwise permitted 9.00% result.
Answer: The rate cannot exceed 8.50% under the stated lifetime cap.
Index falls but a floor applies
Scenario: The index falls to 0.75%, the margin is 2.25%, and the loan has a 3.50% minimum rate.
- Index plus margin equals 3.00%.
- The floor prevents a rate below 3.50%.
- A falling index therefore does not deliver the full calculated decrease.
Answer: The effective rate is 3.50% under the stated floor.
Fixed rate but changing total payment
Scenario: A homeowner's fixed-rate principal-and-interest payment is unchanged, but the servicer increases the escrow deposit after property taxes and insurance premiums rise.
- The note rate has not adjusted.
- Principal and interest remain fixed on the stated schedule.
- Escrowed property costs are separate components of the total payment.
Answer: The total payment can rise without converting the loan into an ARM.
The A-D-J-U-S-T ARM test
- At closing: record the initial rate, initial principal-and-interest payment, loan term, amortization, and fixed-period end date.
- Date: identify the first adjustment, later adjustment frequency, index observation, lookback period, and notice timing.
- Join: add the current index and contractual margin to find the preliminary fully indexed rate.
- Upper and lower limits: apply initial, periodic, and lifetime caps, the floor, and any rounding rule.
- Set payment: use the permitted rate, current balance, remaining term, and any interest-only or payment-cap provision.
- Test exposure: compare minimum, expected, and maximum payments with income, reserves, holding period, sale, and refinance risk.
- Feature
- Contract rate
- Fixed-rate mortgage
- Unchanged
- ARM
- Can reset
- Exam check
- Read note terms
- Feature
- Formula
- Fixed-rate mortgage
- Set at closing
- ARM
- Index plus margin
- Exam check
- Then apply caps and floor
- Feature
- Principal and interest
- Fixed-rate mortgage
- Usually level if fully amortizing
- ARM
- Can recalculate
- Exam check
- Use current balance and remaining term
- Feature
- Total payment
- Fixed-rate mortgage
- Can change
- ARM
- Can change
- Exam check
- Taxes and insurance remain variable
Where do similar terms create traps?
- Trap
- Saying fixed rate means fixed total payment
- Correction
- Taxes, insurance, mortgage insurance, and escrow requirements can change even when principal and interest do not.
- Trap
- Using index alone as the ARM rate
- Correction
- Add the contractual margin before applying caps, floor, and rounding.
- Trap
- Treating margin as the moving component
- Correction
- The margin is ordinarily fixed by the note; the index reflects market movement.
- Trap
- Stopping after index plus margin
- Correction
- Test the formula result against the applicable initial, periodic, and lifetime limits.
- Trap
- Applying the periodic cap at the first reset
- Correction
- Use the initial adjustment cap for the first change when the note provides separate limits.
- Trap
- Measuring every cap from the initial rate
- Correction
- A periodic cap commonly measures from the prior effective rate; the lifetime ceiling commonly measures total change from the initial rate.
- Trap
- Assuming a falling index guarantees a lower rate
- Correction
- The margin, floor, caps, rounding, and prior-rate rule can limit or prevent the decrease.
- Trap
- Confusing rate cap and payment cap
- Correction
- A capped payment can be too small to cover interest and can create deferred interest under some products.
- Trap
- Treating 5/1 as a five-year loan
- Correction
- The five generally describes the initial fixed-rate period, not the full mortgage term.
- Trap
- Assuming all ARMs adjust annually
- Correction
- Read the note because current products can use annual, six-month, or other stated schedules.
- Trap
- Confusing note rate and APR
- Correction
- Use the note rate for interest calculations and APR as a broader disclosure measure.
- Trap
- Recommending a loan from the initial rate alone
- Correction
- Compare margin, caps, floor, fees, maximum payment, holding period, and refinance or sale risk.
Can you separate the terms in a new fact pattern?
These questions are original study items aligned to the published outline. They are not copied, recalled, or predicted PSI questions.
1. Which mortgage keeps its contract interest rate unchanged for the loan term?
- Fixed-rate mortgage
- Adjustable-rate mortgage
- Shared-appreciation mortgage
- Open-end mortgage
Show answer and explanation
Answer: Fixed-rate mortgage
The defining feature is rate certainty, though taxes and insurance can still change the total payment.
2. An ARM index is 4.10% and its margin is 2.25%. Before caps and rounding, what is the fully indexed rate?
- 6.35%
- 4.10%
- 2.25%
- 1.85%
Show answer and explanation
Answer: 6.35%
Index plus margin equals 4.10% plus 2.25%, or 6.35%.
3. Which cap limits the first rate change after a hybrid ARM's initial fixed period?
- Initial adjustment cap
- Subsequent adjustment cap
- Loan-to-value cap
- Escrow cap
Show answer and explanation
Answer: Initial adjustment cap
The initial adjustment cap applies at the first reset; later changes use the subsequent or periodic cap.
4. An ARM began at 4.00% with a 5-percentage-point lifetime cap. What is its stated lifetime ceiling?
- 9.00%
- 5.00%
- 4.00%
- 20.00%
Show answer and explanation
Answer: 9.00%
The maximum total increase is added to the initial rate: 4.00% plus 5.00% equals 9.00%.
5. A homeowner's fixed-rate loan payment rises only because annual property taxes increased. Which statement is best?
- The loan can remain fixed rate because escrow changed
- The loan automatically became an ARM
- The note rate must have increased
- Property taxes are principal
Show answer and explanation
Answer: The loan can remain fixed rate because escrow changed
Fixed rate refers to the contract interest rate. Escrowed taxes and insurance are separate total-payment components.
Where do these ideas appear on the outline?
- Topic
- Fixed-rate mortgage
- What to know
- Constant note rate, full term, principal and interest, level payment, amortization, rate certainty, market-rate movement, refinance, prepayment, taxes, insurance, escrow, and no total-payment guarantee
- Best exam move
- Choose fixed rate when the interest rate itself cannot change under the original loan terms.
- Topic
- Adjustable-rate mortgage
- What to know
- Variable rate, initial period, reset, index, margin, fully indexed rate, adjustment date, caps, floor, rounding, payment recast, notice, and future-rate risk
- Best exam move
- Choose ARM when the note uses a formula and schedule that permit the rate to change after closing.
- Topic
- Initial rate
- What to know
- Start rate, introductory rate, teaser rate, premium rate, fixed period, temporary rate, discount, note rate, first payment, first adjustment, and no fully indexed assumption
- Best exam move
- Do not assume the initial rate equals index plus margin; calculate the fully indexed rate separately.
- Topic
- Initial fixed period
- What to know
- Three years, five years, seven years, ten years, hybrid ARM, first reset date, payment certainty, product notation, month count, year count, and no loan-term confusion
- Best exam move
- The first number in common hybrid-ARM notation usually identifies how long the initial rate remains fixed.
- Topic
- Adjustment frequency
- What to know
- Annual, semiannual, six month, monthly, first adjustment, later adjustment, reset date, rate-change notice, product notation, lookback, and calendar schedule
- Best exam move
- Identify how often the rate can change after the initial period rather than how often payments are made.
- Topic
- Index
- What to know
- Market benchmark, 30-day Average SOFR, Treasury-based index, published source, observation date, lookback, replacement index, movement, not borrower credit, not lender margin, and verification
- Best exam move
- Treat the index as the variable market component named in the note.
- Topic
- Margin
- What to know
- Lender-set percentage points, contract term, fixed after closing, added to index, pricing, fully indexed rate, comparison, no market-index movement, and note disclosure
- Best exam move
- Add the stated margin to the index before testing caps, floors, and rounding.
- Topic
- Fully indexed rate
- What to know
- Index plus margin, preliminary reset, calculated rate, note formula, caps, floor, rounding, initial-rate difference, payment, and no automatic actual-rate conclusion
- Best exam move
- Calculate index plus margin, then determine whether the note permits that entire rate at the current adjustment.
- Topic
- Initial adjustment cap
- What to know
- First rate change, end of fixed period, increase limit, decrease limit, initial note rate, percentage points, cap structure, hybrid ARM, and no periodic-cap substitution
- Best exam move
- Apply the initial cap only to the first reset and measure it from the rate specified by the note.
- Topic
- Subsequent adjustment cap
- What to know
- Periodic cap, later reset, previous rate, increase limit, decrease limit, annual reset, semiannual reset, rate carryover, and repeated changes
- Best exam move
- At a later reset, compare the new calculated rate with the prior effective rate and apply the periodic cap.
- Topic
- Lifetime cap
- What to know
- Maximum total increase, initial rate, ceiling, loan life, minimum rate, floor, product cap numbers, worst-case rate, earliest maximum date, and affordability
- Best exam move
- The effective rate cannot exceed the contractual lifetime ceiling even if index plus margin is higher.
- Topic
- Floor
- What to know
- Minimum rate, margin floor, initial-rate floor, lifetime decrease limit, index decline, downward cap, note terms, no guaranteed decrease, and rounding
- Best exam move
- If the index falls, test the calculated rate against the note's minimum-rate rule.
- Topic
- Rate cap versus payment cap
- What to know
- Interest-rate limit, payment-change limit, deferred interest, negative amortization, recast, balance cap, periodic payment, fully amortizing payment, and separate provisions
- Best exam move
- A payment cap does not necessarily cap accrued interest; unpaid interest can increase principal if the documents allow it.
- Topic
- Payment recalculation
- What to know
- Adjusted rate, current principal, remaining term, amortization, principal and interest, monthly payment, interest-only feature, recast, scheduled change, and escrow exclusion
- Best exam move
- After finding the permitted new rate, use the current balance and remaining amortization period for a standard payment recast.
- Topic
- Total monthly payment
- What to know
- Principal, interest, property taxes, homeowners insurance, mortgage insurance, escrow, dues, assessments, fixed rate, ARM, changing non-rate items, and affordability
- Best exam move
- Fixed rate stabilizes the note rate, not every component of the borrower's housing payment.
- Topic
- ARM disclosures
- What to know
- Loan Estimate, Adjustable Interest Rate table, AIR table, index plus margin, initial rate, minimum, maximum, first change, frequency, limits, projected payments, CHARM booklet, Closing Disclosure, and note
- Best exam move
- Use the AIR table and projected payments to identify how and when the rate and payment can change.
- Topic
- Borrower risk comparison
- What to know
- Payment certainty, initial rate, holding period, rate increase, rate decrease, sale, refinance, qualification, income stability, cash reserve, worst-case payment, points, fees, and break-even
- Best exam move
- Compare total terms and maximum affordable exposure rather than declaring one product universally superior.
- Topic
- Broker boundaries
- What to know
- General explanation, no rate quote, no suitability promise, no refinance guarantee, lender, loan originator, CHARM booklet, disclosure review, affordability, current index, and executed note
- Best exam move
- Explain vocabulary and direct loan selection, pricing, qualification, and disclosure questions to licensed mortgage professionals.
How do you make the distinction stick?
- Session
- Session 1
- Focus
- Separate fixed and adjustable
- Proof you are ready
- Classify 20 product descriptions by rate behavior, payment behavior, and non-loan payment changes.
- Session
- Session 2
- Focus
- Master index and margin
- Proof you are ready
- Calculate 20 fully indexed rates and explain why each is preliminary rather than automatically effective.
- Session
- Session 3
- Focus
- Apply all three caps
- Proof you are ready
- Solve first-reset, later-reset, and lifetime-ceiling problems with changing indices and prior rates.
- Session
- Session 4
- Focus
- Read timing and product notation
- Proof you are ready
- Map initial period, first change, subsequent frequency, index lookback, and notice for 10 sample ARM structures.
- Session
- Session 5
- Focus
- Audit disclosures and risk
- Proof you are ready
- Locate the AIR table, minimum and maximum rate, projected payments, points, APR, and worst-case payment in sample forms.
- Session
- Session 6
- Focus
- Run the A-D-J-U-S-T test
- Proof you are ready
- Score at least 90% and state closing rate, date, joined rate, limits, payment, and exposure for every miss.
Do not count recognition as mastery. Close the notes and explain the rule, apply it to a new fact pattern, and identify why each distractor fails.
Turn the comparison into a test-day decision
From concept to decision
Drill this topic, then review the explanation
Pass Illinois gives you original national and Illinois questions, topic-by-topic study, clear explanations, timed practice, flashcards, progress tracking, and Math Coach. Start free, find the weak distinction, and focus the next session there.
Questions students ask about Fixed-Rate vs. Adjustable-Rate Mortgage
What is a fixed-rate mortgage?
A fixed-rate mortgage keeps its contract interest rate unchanged for the loan term. On a typical fully amortizing loan, the scheduled principal-and-interest payment also remains level. The borrower's total payment can still change if property taxes, homeowners insurance, mortgage insurance, escrow requirements, or other charges change.
What is an adjustable-rate mortgage?
An adjustable-rate mortgage, or ARM, allows the interest rate to change at stated times under a contractual formula. After any initial fixed period, the creditor generally combines a specified index with a fixed margin and applies the loan's rate caps, floor, lookback, rounding, and other terms.
What is the ARM index?
The index is the market-based benchmark named in the loan documents. It can move up or down with market conditions and is outside the borrower's personal control. The exact source, observation date, lookback, and replacement-index provisions matter. Current uniform instruments include products based on 30-day Average SOFR, but candidates should use the index stated in the question.
What is the ARM margin?
The margin is the number of percentage points the lender adds to the index to calculate the fully indexed rate. It is established in the loan agreement and ordinarily does not change after closing. Index plus margin produces the calculated rate before contractual caps, floors, and rounding are applied.
What is a fully indexed rate?
The fully indexed rate is the index plus the margin. If the index is 4.20% and the margin is 2.25%, the fully indexed rate is 6.45%. The rate actually charged at an adjustment can differ because an initial, periodic, or lifetime cap, a floor, or the note's rounding rule applies.
What are the three main ARM rate caps?
The initial adjustment cap limits the first change after the fixed period. The subsequent or periodic cap limits later changes from one adjustment to the next. The lifetime cap limits the total increase over the loan's life, usually measured from the initial rate under the note. A floor can limit downward movement.
What does a 5/1 ARM mean?
In the common 5/1 notation, the rate is fixed for the first five years and can adjust once each year afterward. Current products can use different adjustment frequencies, including six-month schedules, so always read the product name, Adjustable Interest Rate table, and note rather than assuming the second number uses the same unit in every document.
Can an ARM rate decrease?
It can if the index falls and the note permits a lower rate, but the margin, floor, caps, rounding, and prior-rate limits can prevent the borrower from receiving the entire market decline. Never state that an ARM payment must fall merely because a benchmark moved down.
Is APR the same as an ARM interest rate?
No. The note rate is used to calculate interest under the loan terms. APR is a disclosure measure designed to reflect the annualized cost of credit, including specified charges and assumptions. Compare note rate, APR, points, fees, payment features, and maximum exposure separately.
Are these official PSI questions?
No. They are original questions aligned to the national Financing outline effective June 24, 2026. The current PSI bulletin, CFPB mortgage guidance and CHARM booklet, Regulation Z, and current Fannie Mae and Freddie Mac uniform instruments were reviewed through August 1, 2026.
Primary sources
- PSI Illinois Candidate Information Booklet dated June 24, 2026
- Consumer Financial Protection Bureau, current fixed-rate and ARM comparison
- Consumer Financial Protection Bureau, current ARM index and margin explanation
- Consumer Financial Protection Bureau, current ARM cap explanation
- Consumer Financial Protection Bureau, current Consumer Handbook on Adjustable-Rate Mortgages
- 12 CFR 1026.19, current variable-rate disclosure requirements
- Fannie Mae, current fixed-rate and 30-day Average SOFR uniform notes and riders
The current official outline controls the tested scope. Statutes, regulations, and official agency materials control when a general study rule and a jurisdiction-specific rule differ.
Editorial status
Checked against primary sources
The Pass Illinois editorial team last checked this guide on August 1, 2026. Every practice question is an original study item, and the source links above let you verify the rules that support the lesson.