The problem
Most year-end handoffs start as a scavenger hunt. The bookkeeper exports a trial balance, the owner digs through a shared drive for missing receipts, and three different versions of the same spreadsheet circulate by email. Your CPA spends billable hours asking for documents that should have been attached to the journal entry the day the transaction posted. By the time the return is filed, nobody is fully confident the numbers reconcile to the bank, the cards, and the underlying paperwork.
The real cost shows up later. A CP2000 or a state notice arrives twelve to eighteen months after the period closed. The person who recorded the original entry has moved on, the receipt is buried in an inbox, and the rationale for a reclassification lives only in someone's memory. Reconstructing a period after the fact is slow, expensive, and rarely produces a clean answer.
Audit anxiety is the predictable result. Owners avoid looking at the books because every glance surfaces another gap. CPAs hedge their work because they cannot independently verify the source documents. ATCS is designed to remove that anxiety by making the underlying record permanent, attached, and auditable from the moment a transaction is entered.
How it works
One-click handoff bundle
At year-end, or any cutoff your CPA prefers, ATCS assembles a single handoff package keyed to the tax year. The bundle includes a finalized profit and loss statement, the full transaction register for the period, an indexed list of every attached document with the transaction it supports, and a 1099 vendor list with payment totals and contact information. Your CPA receives one organized package instead of a chain of follow-up emails.
Closed-period enforcement
Close cycles in ATCS move through three explicit states: open, in_review, and closed. Once a period is closed, the ledger is locked. New entries cannot be backdated into a sealed period, and existing entries cannot be silently overwritten. If a correction is genuinely required, it is recorded as a dated adjusting entry in the current open period with a clear reference to the original. Your prior-year P&L stays the same prior-year P&L every time your CPA opens it.
Per-transaction document attachments
Receipts, vendor invoices, bank and card statements, and signed contracts attach directly to the transaction they support. There is no separate document folder to keep in sync. When your CPA clicks a line on the transaction register, the source document is one click away. When the IRS asks for substantiation on a specific deduction, the proof is already linked to the entry rather than waiting to be hunted down.
Append-only audit log
Every meaningful action in the system writes to an append-only audit log: who created the entry, who edited it, who attached the document, who closed the period, and what the prior values were before each change. The log cannot be edited or pruned by users. Periodic rollups summarize activity by user, period, and entity so your CPA can see the shape of the activity without reading every line. If anyone questions a number, the answer is in the log.
What you get
- A CPA handoff bundle generated per tax year, including P&L, transaction register, document index, and 1099 vendor list
- Close cycle workflow with open, in_review, and closed states and enforced locked-period rules
- Append-only audit log with user, timestamp, action, and prior values on every change
- Audit log rollups by period, user, and entity for quick review
- Receipt, invoice, statement, and contract attachments stored with the transaction
- Year-to-date and prior-period comparison reports for the CPA's review
- Role-based access so reviewers, preparers, and owners see only what they should
- An IRS-ready document trail that connects every deduction to its source
- Adjusting-entry workflow that preserves history when corrections are required
- Vendor records that aggregate payments toward 1099 thresholds during the year, not in January
- Export-ready files your CPA can pull into their tax workpapers
- A consistent record retention posture across tax years
FAQ
How is the handoff bundle different from a QuickBooks export?
A typical export gives your CPA a trial balance and a list of transactions. The ATCS handoff bundle adds the document index that ties each transaction to its source attachment, the 1099 vendor list compiled across the year, and the audit log rollup for the period. Your CPA receives substantiation alongside the numbers, not the numbers alone.
Can we still adjust closed periods?
No entry inside a closed period can be silently changed. If a correction is required, ATCS records an adjusting entry in the current open period with a reference back to the original transaction. Your prior-period statements remain stable, and the correction is fully traceable in the audit log.
What does the audit log capture?
The log records every create, edit, attachment, reclassification, and close action. Each entry stores the user, the timestamp, the action taken, and the prior values where applicable. The log is append-only, so users cannot remove or rewrite entries. Rollups summarize activity for fast review without losing the underlying detail.
How long is data retained?
ATCS retains transactions, attachments, and audit log entries across tax years so prior-period reports remain reproducible. Retention is configured to align with standard small-business recordkeeping expectations for tax and audit purposes. Your CPA can pull a prior-year handoff bundle at any time without rebuilding it from raw data.
What if the IRS opens an audit?
Because every transaction already has its source document attached, and every change is captured in the audit log, an IRS request becomes a lookup rather than a reconstruction. Your CPA can produce the requested period's transaction register, the supporting attachments, and the change history directly from ATCS, with no ambiguity about what the original entry looked like.
Where to next
Move your year-end from a scavenger hunt to a clean handoff. Use the pricing calculator to size ATCS for your entity count and transaction volume, then review how clean books begin upstream on the bookkeeping & reconciliation page.