Free IRS Tools for Notices and Tax Debt
Each tool on this page links to the guides behind it, and every rule those guides use is taken from IRS.gov, the Internal Revenue Code or the Tax Court and cited at the bottom of the guide. The tools explain; they do not give legal or tax advice.
IRS notice lookup
Type the code on an IRS notice, such as CP14, CP2000, LT11 or Letter 525, to see what the notice is, the deadline our guide explains, and the guide itself. The IRS says the CP or LTR number is on the right corner of the letter.
CSED calculator
Estimate the Collection Statute Expiration Date for one assessment. Under 26 U.S.C. § 6502(a), the IRS may collect by levy or court proceeding within 10 years after assessment; the calculator adds the pauses the statute and the Internal Revenue Manual describe, such as a pending offer, a payment plan request, a CDP hearing or a bankruptcy stay.
Offer in compromise calculator
Estimate the minimum offer that the Form 433-A (OIC) arithmetic produces: equity in assets, mostly at 80% of current market value less loans, plus remaining monthly income times 12 for a lump sum offer or 24 for a periodic one. The two expense lines the form ties to IRS standards fill in from the Collection Financial Standards effective June 29, 2026.
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IRS Circular 230 Disclosure: To ensure compliance with Treasury Department rules governing tax practice, any tax information contained on this website was not written and is not intended to be used, and cannot be used, for the purpose of avoiding any federal tax penalty. You should consult a licensed tax professional regarding your individual situation.
Results described on this website are not a guarantee, warranty, or prediction of the outcome of any tax matter. Every situation is different. Prior results do not guarantee a similar outcome. Article content reflects general information about federal tax procedure as of the last reviewed date and may not reflect subsequent changes in IRS policy, regulations, or case law.