Accounting

When (and How) to Switch From Cash to Accrual Accounting

Cash basis is simple but lies about timing. Here's when accrual is required, when it's just smart, and how to switch.

By Aparna Devalla, CPA3 min · 5 slidesUpdated May 3, 2026

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Cash basis: revenue when cash arrives, expense when cash leaves. Simple, easy to explain to anyone.
Accrual basis: revenue when earned (regardless of payment), expense when incurred (regardless of payment). Matches revenue with the cost of producing it.
Cash basis can wildly distort a real picture — a December invoice paid in January looks like nothing happened in December.
Accrual gives you P&L that means something: gross margin, monthly trends, true profitability per period.

C-corps and partnerships with a C-corp partner generally must use accrual once average gross receipts exceed ~$30M (2024 threshold; adjusted annually).
If you carry inventory of any meaningful size and aren't a small-business taxpayer under §471(c), accrual treatment for inventory may be required.
If you have outside investors, lenders requiring GAAP financials, or are preparing for audit / due diligence — accrual is effectively required.
Banks underwriting loans of any size will reject cash-basis books for serious credit decisions.

You bill on net-30 or longer terms — cash basis hides receivable and revenue trends for a full month.
You buy inventory or pay vendors in advance — cash makes good months look bad and bad months look good.
You're trying to understand unit economics — cash basis numbers are useless for margin analysis.
You want to compare to industry benchmarks — virtually all of them are accrual-based.

File Form 3115 (Application for Change in Accounting Method) with your tax return for the year of change.
Calculate the §481(a) adjustment: the cumulative difference between cash and accrual at the moment of switch (think: ending AR + ending accrued income − ending AP − ending accrued expenses).
Net positive §481(a) adjustment ($25K+ usually) is spread over 4 years. Negative adjustment is taken in the year of change.
Books-side: build out AR, AP, deferred revenue, accrued expense, and prepaid expense ledgers. Run parallel accrual books for at least one quarter before going live.

Switching mid-year informally — without Form 3115, the IRS can disallow the change and force you back.
Forgetting the §481(a) adjustment — leads to either double-counting or skipped income.
Not training your team on accrual entries — receivables aged 90+ and unbilled revenue suddenly need management.
Treating sales tax payable, payroll liabilities, and deferred revenue as cash items — they're balance sheet items, not P&L.
Need help with the switch? Rubric Financial handles cash-to-accrual conversions including the §481(a) adjustment.