Gross Monthly Income: What It Is and How to Calculate It
Landlords and lenders ask for gross monthly income, not what lands in your account. Here is the calculation for each pay frequency and the mistake that throws it off by hundreds.
Almost every application that involves money asks for gross monthly income. Rental applications use it against the rent, lenders use it to calculate debt-to-income, and benefit programmes use it for eligibility. It is also the figure people most often get wrong, usually by a few hundred dollars.
Gross, Not Net
Gross income is what you earn before anything is removed: income tax, Social Security and Medicare, insurance premiums, retirement contributions. Net pay is what arrives in your account. The gap between them is typically 20 to 35 percent, so quoting the wrong one materially changes the answer.
If you are reading from a pay stub, gross pay is the figure directly above the deductions section, not the number at the bottom.
The Calculation by Pay Frequency
- Annual salary: divide by 12.
- Monthly: the figure is already monthly.
- Semimonthly (24 checks a year): multiply one check by 2.
- Biweekly (26 checks a year): multiply one check by 26, then divide by 12.
- Weekly (52 checks a year): multiply by 52, then divide by 12.
The biweekly case is where the common error lives. Two biweekly checks are not one month, because 26 checks spread across 12 months averages about 2.17 per month. Doubling a biweekly check understates annual income by roughly 8 percent.
Variable and Multiple Incomes
Hourly workers with changing schedules should average over a longer window, ideally three to six months, and use the year-to-date figure on a recent stub as a cross-check: divide year-to-date gross by the number of months elapsed. If you hold more than one job, calculate each separately and add the monthly results.
Overtime, bonuses and commission are trickier, because underwriters often want a two-year history before counting them as stable income. I work through the variable-income cases, with examples for each pay frequency, in my guide to calculating gross monthly income for Online Paystub.
Check Your Answer
Take the gross year-to-date figure from your most recent pay stub and divide it by the number of months completed in the year. If that result is close to the number you calculated, your figure is sound. If it is far off, the pay-frequency multiplier is usually the culprit.
