The Home Affordability Calculator asks for your gross income and lets you label it as either monthly or annual, and the choice simply tells the tool which number you typed - it does not change which math is applied, because the calculator internally converts both choices to the same gross monthly figure before applying the 28/36 debt-to-income rule. Picking monthly means you are entering the dollar amount that lands in your pay each month before deductions; picking annual means you are entering the full-year gross salary figure on your W-2 or offer letter. Both are valid inputs, and the calculator will give the same answer for the same person as long as the number you type actually represents what you say it represents. The frequency toggle exists because paychecks, pay stubs, W-2s, and offer letters all report income on different schedules, and the tool meets you where your numbers already live. Choosing the wrong label for a correct number is a labeling error, not a math error; choosing the right label for a wrong number is still a wrong answer, so the more important question is whether the dollar figure itself is accurate.
Behind the toggle, the calculator works in monthly terms no matter which option you choose. The 28/36 rule compares your income to a monthly housing budget, so the tool divides annual income by 12 internally when you pick annual, and uses the number as-is when you pick monthly. The Home Affordability Calculator does this conversion for you, so your job is only to match the label to the document you are reading from.
When Monthly Income Is the Right Pick
Pick "monthly" when the number you are looking at is already a monthly figure. Common cases include a recent pay stub showing gross pay per pay period (you can take the per-paycheck number and multiply by the number of paychecks per year, then divide by 12, but most people find it easier to enter the monthly equivalent directly), a bank direct-deposit history showing consistent monthly inflows, or a freelancer who tracks monthly retainer income. If you earn a stable salary that does not fluctuate seasonally, choosing monthly and entering your gross monthly salary is often the most direct route, because it skips a mental division step and keeps the number simple to verify against your statement.
Monthly is also the right pick when your pay is reported in months rather than years - for example, if your employer quotes compensation as "$X per month" in an employment contract, or if you manage household finances on a monthly budget and want the result to feel intuitive against your monthly cash flow. Choosing monthly puts the calculator in lockstep with the budgeting rhythm you already use.
When Annual Income Is the Right Pick
Pick "annual" when the cleanest source of your gross income is a yearly total. That covers W-2 forms (Box 1 shows annual gross wages for the calendar year), offer letters that list a yearly base salary, salary ranges from job postings, and self-employment 1099 totals before tax. If you have a year-end summary - whether from your employer, your accountant, or your own bookkeeping - entering that figure as annual is the simplest match, because you avoid multiplying or dividing by 12 yourself and you avoid transcription errors in the conversion step.
Annual is also the natural pick for variable earners who smooth out their income over a full year: commission-based employees, freelancers with seasonal swings, gig workers, and small-business owners who net out a year on their tax return. Entering an annual total reflects your realistic, averaged earning power rather than a single high or low month. The 28/36 rule is built around a steady monthly view of income, so smoothing volatile income across the year gives the rule a stable denominator.
Quick Reference: Which Toggle Fits Your Source
| Source document or situation | Recommended toggle | Number to enter |
|---|---|---|
| Recent pay stub (gross per pay) | Monthly | Gross per month (annualized gross divided by 12) |
| W-2 Box 1 (annual wages) | Annual | Box 1 figure |
| Offer letter or job posting | Annual | Yearly base salary |
| Self-employment 1099 total | Annual | Total before tax |
| Hourly wage or shift work | Monthly | Hourly times 40 times 52 divided by 12 |
| Monthly retainer or contract | Monthly | Gross monthly retainer |
How to Enter Income Frequency in the Calculator
This is the concrete task your search leads to. The Home Affordability Calculator puts the income entry and its frequency label on the same first row, so the choice is right next to the number you type.
- Locate the gross income field on the first row of inputs. To the right of the field, find the frequency selector labeled "monthly" or "annual".
- Decide which document you are reading your number from. If you are looking at a monthly pay stub or monthly bank deposit, leave the selector on "monthly". If you are looking at a W-2, offer letter, or annual 1099, switch it to "annual".
- Type the gross income figure from that document into the income field. Do not subtract taxes, retirement contributions, or other deductions - "gross" means pre-deduction.
- Enter your total recurring monthly debt payments in the next field. This number is always monthly, regardless of how you labeled your income.
- Move on to the second row: enter your planned cash down payment, your expected annual interest rate, and the loan term in years.
- Read the result panel: the affordable home price, the affordable loan amount, and the maximum monthly housing payment all recalculate instantly under the 28/36 rule.
If you realize mid-entry that you picked the wrong label, change the selector and re-enter the matching number - the result will recalculate as soon as both the label and the field are updated.
What Stays the Same Either Way
No matter which toggle you pick, three things remain constant. First, the income figure must be gross, not net - the 28/36 rule is built on pre-tax earnings so the housing budget scales with your full earning power, not your take-home. Second, the debt field is always monthly; if you have annual debt totals (for example, an annual summary of credit-card minimums), you will need to divide by 12 before entering them. Third, the down payment is a dollar amount, not a percentage, and it is added on top of the maximum loan to give you the maximum home price.
A quick conversion check worth doing: if you pick annual and enter $72,000, the calculator will divide by 12 internally to get a $6,000 gross monthly income. If you pick monthly and enter $6,000 directly, the calculator uses $6,000 as-is. With identical other inputs (debts, down payment, rate, term), both entries produce the same affordable home price - confirming the toggle is a labeling choice, not a math choice. The front-end ratio of 28% applied to $6,000 gives a maximum monthly housing payment of $1,680, before debts are considered.
Reading the Result After You Choose
Once the income frequency is set, three outputs tell you whether your budget is realistic. The "affordable home price" is the loan amount plus your down payment; this is the top of your realistic search range. The "affordable loan amount" is the principal you can borrow given your maximum monthly housing payment, your interest rate, and your loan term - this is the inverse-amortization step, where the calculator turns a payment ceiling back into a loan ceiling. The "maximum monthly housing payment" is the smaller of two numbers: 28% of your gross monthly income, or 36% of your gross monthly income minus your other monthly debts, clamped to zero or above. As described by the Wikipedia debt-to-income ratio entry, the 28/36 rule sets a front-end ceiling and a back-end ceiling, and your budget is the more restrictive of the two.
Because every input is independent, you can leave income frequency fixed and change debts, down payment, rate, or term to see how each one moves your budget. Paying off a car loan raises the maximum housing payment because the back-end ratio has more room. A larger down payment raises the affordable home price without changing your monthly housing budget. A shorter loan term lowers the maximum loan because the same payment supports less principal when amortized over fewer months. These trade-offs can be explored in the same session, all without revisiting your income frequency choice.
For a deeper look at what each input controls, the guide Home Affordability Calculator With Steps for Each Input walks through every field in order. If you want to confirm the 28/36 framework itself, the Consumer Financial Protection Bureau page on debt-to-income ratios explains how lenders read the same numbers when you actually apply for a mortgage.
If you're weighing options, How to Compare Home Affordability Approaches by Income covers this in detail.