Plan the cutover
When to Switch Accounting Software (and Why January 1 Beats Everything Else)
Quick answer: the best day of the year to switch accounting systems is January 1 — payroll starts a fresh tax year with zero re-entry, your CPA gets one clean year in one system, and prior years stay in a tidy archive. The trade-off: a January 1 go-live is decided in September, prepared in October, and converted in November–December. Here’s the full working-backwards timeline.
Why January 1 beats every other date
- Payroll starts clean. Mid-year, every active employee’s year-to-date figures must be re-entered so W-2s come out right. On January 1 there are no YTDs — the whole problem evaporates.
- One tax year, one system. Your CPA gets a full year of books in a single place; no stitching two systems together at filing time.
- Clean comparatives. Prior-year reports live in the read-only archive; the new system starts at a natural zero.
- Sales tax and 1099s align. Cutover after your final filings of the year, before the first of the new one.
The timeline nobody tells you (work backwards from Jan 1)
- September — decide. Choose the destination and get fixed quotes. This is the step businesses delay, and it’s why half of all “January” switches slip to March.
- October — prepare. Clean lists, reconcile accounts, choose your history scope. Our printable checklist is exactly this phase.
- November–December — convert and validate. The migration runs on a copy while you keep working; go-live waits until the trial balance ties to the penny.
- January 1 — first new transaction in the new system. Nothing re-entered, nothing lost.
The catch: everyone wants December. Migration calendars (ours included) fill from October onward — scoping in September isn’t keenness, it’s how you get the slot.
If you can’t wait for January
Quarter starts (April 1, July 1, October 1) are the next-best dates — sales-tax periods align and mid-quarter stitching is avoided. A mid-year move is entirely doable; it just adds the payroll YTD work. If the current system is actively hurting you — corrupted file, unsupported version, a team that can’t work — don’t wait for a tidy date. Run your file through our free File Analyzer to see what you’re dealing with.
Common questions
How long before January 1 should we start?
Scope in September, prepare in October, convert in November–December. A simple file can compress that to 4–6 weeks, but December capacity is the constraint everywhere — earlier is cheaper and calmer.
Can we keep using our old software until the switch?
Yes — the conversion runs on a backup copy while your team keeps working. Only the final days before go-live need a freeze or a change-log.
What about our payroll history?
It stays readable forever in your old system's archive. In the new system, payroll simply begins on January 1 — which is precisely why that date wins.