Bookkeeping for Unfiled Years: Rebuilding From the Bank
Updated 2026-10
Two jobs, kept separate
Unfiled years involve a bookkeeping job and a tax job. The bookkeeping job is producing an accurate set of numbers for each year from the records that exist. The tax job is deciding how many years to file, in what order, what penalty relief might apply, and how to deal with anything the IRS has already assessed. Your bookkeeper does the first; your tax preparer does the second. This page is about the first, and about handing over cleanly to the second.
What the IRS already knows
For each year, the IRS holds a wage and income transcript: every W-2, 1099-NEC, 1099-K and 1099-INT reported about you or the business. If no return was filed, the IRS may have prepared a substitute return from those figures, which assumes income and allows almost no expenses. The transcript is the anchor for the rebuild: income in the books should reconcile to it, and expenses are what the rebuild adds.
Anchoring each year
- Bank and card statements for every month, requested from the bank where not online
- The transcript, for reported income
- Processor and marketplace reports, for gross sales and fees
- The last filed return, for year-end balances that start the chain
- Loan statements, payroll records and whatever receipts exist, sorted by year
The order of work
Oldest year first, each reconciled and closed with a package before the next begins, because returns are filed in order and each year’s closing balances open the next. If one year has an immediate deadline or an IRS notice attached, it jumps the queue. The current year is kept up alongside so the backlog stops growing while the old years are rebuilt.
What the package for each year contains
A reconciled profit and loss and balance sheet, the fixed-asset list as of that year, loan balances, 1099 data at that year’s threshold, and a note of every assumption made where records were missing. The assumptions matter: a preparer can defend a documented estimate and cannot defend a number that appeared from nowhere.
Where the tax conversation starts
Once a year’s package exists, your preparer decides how it is filed and what is said about penalties. Relief programmes exist and depend on history and circumstances. If you do not have a preparer, say so in the request; the package is the same, and your bookkeeper will work with whoever you choose.
Where to go next
Common questions
Should I contact the IRS before the books are done?
That is a question for your tax preparer, and the answer often depends on whether a notice has already arrived. Getting the oldest year’s books started does not wait for it.
How do I get the transcript?
Through an IRS online account, by form, or through your preparer. Your bookkeeper will say which years to request.
Can all the years be rebuilt at once?
They are worked in order, but the current year can be kept up in parallel so nothing new falls behind.