IRS NOTICE
CP501 — Balance due (second notice)
A follow-up balance-due notice sent after the CP14, asking the taxpayer to pay or contact the IRS before the account moves to collections.
General information only. Not legal or tax advice.
Typical response window
Typically about 21 days. The window printed on your notice governs — always confirm it against your actual notice.
What the first hour looks like
Confirm whether payments or correspondence have already been sent, gather the payment record, and flag the timeline before the account advances further.
Starter document checklist
- The CP501 notice and any earlier balance-due notices (CP14)
- The filed return for the tax period
- IRS account transcript for that year
- Proof of any payments made since the CP14 (canceled checks, EFTPS confirmations)
- Documentation of any pending payment arrangement or dispute
Do the whole first hour in one place
TaxRiskOS captures the notice, computes the deadline, builds the checklist, flags whether it needs partner or counsel review, and produces a clean handoff packet — the first hour, made repeatable. It documents process, not advice.