How this instrument works
The Paycheck Protection Program used a single arithmetic rule to size nearly every standard loan: take a business's average monthly payroll cost and multiply by 2.5. Congress picked that multiplier to approximate ten weeks of payroll — the original eight-week covered period the CARES Act set for spending the money, with a small cushion built in — rather than to reflect creditworthiness, collateral, or any of the underwriting a bank would normally run on a loan this size.
Average monthly payroll cost is not a business's full payroll expense. It caps each employee's cash compensation at $100,000 a year (so $8,333 counts per employee per month even if actual pay ran higher), adds employer-paid health insurance and retirement contributions, and excludes payroll taxes withheld from employee paychecks and pay sent to anyone outside the United States. A bookkeeper reconstructing a 2020 application, or an accountant checking a client's loan against the SBA's cap during a forgiveness review, works from exactly this narrower figure, not the number on a standard payroll summary report.
The formula is a flat multiplier with no tiers and no built-in ceiling of its own, so this instrument keeps scaling the answer past figures no lender actually funded — the real program capped every loan at $10 million and gave hotels and restaurants under NAICS code 72 a 3.5× multiplier instead of 2.5×. This sheet applies the standard 2.5× rule used by most borrowers; it does not model that hospitality exception, the alternate look-back periods seasonal employers could elect, or how much of any resulting loan was ultimately forgiven.
- Enter Average monthly payroll, $ using the capped, benefits-inclusive payroll cost the SBA defined — not your raw payroll register total.
- Read Maximum PPP loan amount, $ — the instrument multiplies your payroll figure by the fixed 2.5× rule.
- Recalculate with a different look-back month's payroll if your business's staffing varied seasonally, and compare the two results.
- Treat the figure as a loan ceiling, not a forgiveness amount — spending rules, separate from this formula, determined how much of it was later forgiven.
Worked example — $20,000 a month in payroll
A small business with average monthly payroll of $20,000 — say, four employees earning a combined amount that nets to that figure once benefits and the per-employee cap are applied — enters avgMonthlyPayroll = 20000. The instrument multiplies by the fixed 2.5 and returns a Maximum PPP loan amount, $ of exactly $50,000, the ceiling a lender could approve for that payroll figure under the standard rule.
That $50,000 was not automatically free money. Under CARES Act rules the business had to spend at least 60% of it on payroll costs within the covered period to qualify for full forgiveness, with the remainder allowed toward rent, mortgage interest, or utilities; spend less than that share on payroll, or cut headcount or pay significantly, and the forgiven portion shrank accordingly.
Questions
What counts as payroll cost in this formula?
Cash compensation up to $100,000 a year per employee ($8,333 a month), plus employer-paid health insurance premiums, retirement contributions, and state unemployment tax. It excludes federal payroll taxes withheld from paychecks, compensation above the per-employee cap, and pay to employees living outside the United States.
Why does the formula use 2.5 times monthly payroll?
Congress sized the multiplier to approximate ten weeks — the original eight-week covered period for spending the loan, with a small buffer, before that covered period was later extended to 24 weeks. The multiplier itself never changed to match; 2.5× stayed the standard rule for most borrowers for the program's full duration.
Did every business get the 2.5× multiplier?
No. Hotels and restaurants classified under NAICS code 72 could use a 3.5× multiplier instead, reflecting how much of that industry's cost structure is payroll. This calculator applies only the standard 2.5× rule most other borrowers used, so a hospitality business's actual maximum loan could run higher than the figure shown here.
Is the loan amount the same as what got forgiven?
No — this formula sizes the loan a lender could approve, not what the SBA later forgave. Forgiveness depended on spending at least 60% of the loan on payroll within the covered period and maintaining headcount and pay near pre-pandemic levels; a business that cut staff or spent the money elsewhere had part of the loan converted into a standard, repayable loan instead.
Can a business still apply for a PPP loan today?
No. The Paycheck Protection Program stopped accepting new applications on May 31, 2021, and it has not reopened since. This calculator is now used mainly to reconstruct or verify a historical loan amount — checking an old application, an accountant's forgiveness file, or a lender's records against the formula the program actually used.
How is a PPP loan different from an SBA EIDL loan?
They were separate programs with different rules. A PPP loan was sized from payroll cost and could be partly or fully forgiven if spent correctly; an Economic Injury Disaster Loan was sized from broader economic loss, accrued interest from the start, and had to be repaid in full. A business could apply for both, but the two loan amounts were never calculated the same way.
References
- U.S. Small Business Administration — Paycheck Protection Program
- U.S. Department of the Treasury — Paycheck Protection Program
Read this first: This instrument shows arithmetic, not advice. Real offers add fees, taxes and terms that vary by lender and place — verify the figures against your actual paperwork before deciding anything.