You switch payroll software by exporting your employee master data, salary structures, leave balances, PF/ESI details, and YTD (year-to-date) tax figures from the old system, then importing them into the new one before running the first payroll cycle. The best time to make this switch is right after closing a financial quarter or a calendar month, when all statutory filings are up to date and no mid-cycle salary run is pending.
The whole process takes two to four weeks for a business with 20-150 employees. A textile manufacturer in Surat with 80 employees and tidy records might finish in 10 days. A multi-branch chain in Pune with 120 staff across five outlets could take closer to three weeks.
Key Takeaways
- Time the switch after a quarter-end or financial year-end when statutory returns are filed
- Export six data categories: employee master, salary structure, attendance/leave, PF/ESI, YTD tax, and loan/advance balances
- Run parallel payroll (old and new system) for at least one month before cutting over
- Verify the first payslip from the new system against the last payslip from the old one, line by line
- Never switch mid-month or during a PF/ESI filing window
When Is the Right Time to Switch?
Not every month is a good month. The safest windows are April (start of the financial year, when YTD resets to zero), July, October, and January (quarter-ends, when TDS returns are freshly filed). Switching in the middle of a quarter means your YTD figures split across two systems, and reconciling them for the next TDS return becomes a headache nobody on the HR team wants.
The worst time? February or March. PF annual returns, Form 16 generation, and investment proof collection all pile up in Q4.
A practical window: close March payroll on the old system, file all Q4 returns by 15 April, start configuring the new system from 16 April. First live salary run on the new system: May 2026. That gives you a full parallel month using dummy data before real salaries go through.
What Data Do You Need to Export?
Six categories. Miss any one of them and your first payroll on the new system will have errors.
1. Employee master data. Names, employee IDs, PAN, Aadhaar, UAN (for PF), ESI IP numbers, bank account details, date of joining, designation, department, and reporting manager. This is the foundation. If your old system lets you export a CSV or Excel file with these fields, that is the cleanest path. If not, you will need to extract it manually from the employee database or the HRMS module.
2. Salary structures. CTC breakup for each employee: basic salary, HRA, DA, special allowance, conveyance, and any other components. The new system needs to know how each person’s salary splits across these heads. A diagnostic lab chain in Thane with 45 employees might have three different salary structures (one for lab technicians, one for admin staff, one for doctors), and each needs to map correctly. Our CTC vs gross vs net salary guide explains how these components relate to each other.
3. Attendance and leave balances. Current CL, SL, and EL balances as of the switch date. If you cut over on 1 May, every employee’s leave balance as of 30 April must transfer to the new system. Losing this data means employees either lose earned leave days they are owed or claim days they already used.
4. PF and ESI details. UAN, PF account number, ESI IP number, and the contribution history for the current financial year. The new system needs these to continue filing monthly PF and ESI returns without a break. Missing even one month’s contribution data can trigger a notice from the EPFO.
5. Year-to-date tax figures. Total taxable income, total TDS deducted, declared investments, and HRA exemptions claimed, all as of the last completed month. These numbers feed into the new system’s monthly TDS calculation. If the YTD is wrong, every subsequent TDS deduction will be wrong, and Form 16 at year-end will not reconcile.
6. Loan and advance balances. Any outstanding salary advances, staff loans, or EMI recovery schedules. The new system must pick up where the old one left off, deducting the right instalment from the right employee’s salary each month.
How Do You Actually Move the Data?
The mechanics depend on what your old system supports. Three common paths:
CSV/Excel export-import. Most payroll software dumps employee data, salary structures, and leave balances into a spreadsheet. The new vendor provides an import template. Map old columns to new ones, clean up formatting, upload. Most common method for Indian SMEs.
API-based migration. Both systems talk directly. No spreadsheet in the middle. Rare for small businesses, common between enterprise platforms.
Manual entry. The fallback nobody wants. If the old system has no export and no API, someone keys in every record by hand. For example, a garment factory in Maninagar with 35 workers might finish in a day. A hospital chain with 200 staff across four branches could take a week.
Whichever path: do not enter data directly into the live environment. Use a staging instance first. Import, verify 10-15 employee records, check salary calculations, then push to production.
Should You Run Both Systems in Parallel?
Yes. Run both old and new for at least one payroll cycle, ideally two. Here is why.
Process the same month’s attendance through both systems. Generate payslips from both. Compare them side by side. If the net pay matches for every employee (within ₹1-2 for rounding), the new system’s configuration is correct. If there is a gap, you catch it before real money moves.
Consider this example: a multi-outlet QSR brand in Hyderabad runs December payroll on both the old and the new system during a switch. The parallel run catches a shift-mapping error: night-shift overtime for the central kitchen calculates at 1.5x instead of 2x. That would underpay 12 workers by ₹1,800 each. One parallel cycle catches it before real money moves.
Running two systems for a month costs almost nothing. A wrong payroll hitting 50 bank accounts on the 7th costs a lot.
What Are the Common Mistakes During Migration?
Five patterns show up repeatedly across payroll migrations:
Forgetting mid-year tax data. Businesses switching in July or October carry six or nine months of YTD figures. If this data does not transfer, TDS calculations restart from zero. For example, if an electronics retailer in Electronic City switches in October without carrying over the April-September YTD, 18 employees could receive inflated TDS deductions in November because the new system starts the tax calculation from zero.
Mismatched salary component names. The old system calls it “Transport Allowance.” The new one maps it to “Conveyance Allowance.” Wrong column mapping means the amount lands in the wrong head, throwing PF or tax calculations off. Verify component-level mapping before going live.
Skipping the leave balance transfer. Some teams treat leave data as secondary. It is not. An employee with 22 days of earned leave accumulated over three years has a financial entitlement. If that balance disappears during migration, the company either owes the employee leave encashment it did not intend to pay, or the employee loses days they legitimately earned.
Not updating the biometric device. If your attendance feeds into payroll, the device must point to the new software. For example, if a cloud kitchen in Bopal skips this step, the face scanner keeps syncing to the old system and the new payroll runs two weeks with no attendance data flowing in.
Cutting over without a rollback plan. What if the new system fails at 11 PM on the 6th and salaries are due on the 7th? Keep the old system in read-only mode for at least 60 days. If month one breaks, you revert and process that cycle on the old platform while the issue gets fixed. Our list of payroll software red flags covers what to vet before you commit to a new vendor in the first place.
What Should Your Migration Checklist Look Like?
| Week | Task | Owner |
|---|---|---|
| Week 1 | Export employee master, salary structures, PF/ESI data from old system | HR + old vendor |
| Week 1 | Sign up and configure new system (company details, branches, shifts) | HR + new vendor |
| Week 2 | Import data into new system’s staging environment | HR + new vendor |
| Week 2 | Verify 15-20 employee records: salary breakup, PF numbers, leave balance | HR |
| Week 3 | Run parallel payroll for the current month on both systems | HR |
| Week 3 | Compare payslips line by line; flag and resolve gaps | HR |
| Week 4 | Go live on new system; old system moves to read-only | HR + IT |
| Week 4+ | Monitor first 2 live payroll cycles; keep old system as backup for 60 days | HR |
At Petpooja Payroll, the onboarding team handles weeks 1-3 alongside the client’s HR. Data import templates, parallel-run support, and a dedicated migration manager come built into the setup process. The employee self-service portal goes live from week 4, so staff can view their salary slips and leave balances on the new system from day one.
Conclusion
Switching payroll software is a data problem, not a technology problem. Pick the right month. Export all six data categories. Run parallel for one cycle. Compare every payslip. Then cut over. The businesses that lose data during migration are almost always the ones that skipped the parallel run or forgot the YTD tax figures.
Frequently Asked Questions
Two to four weeks for most Indian SMEs with 20-150 employees. The first week covers data export and system setup. The second week handles import and verification. The third week runs parallel payroll. Week four is the go-live. Businesses with cleaner records finish faster. You can use our payroll ROI calculator to estimate the cost savings from switching.
Yes, but you must transfer all YTD tax data (total taxable income, TDS deducted, investments declared) to the new system. The new software will continue the TDS calculation from where the old one stopped. At year-end, Form 16 pulls from the new system’s data, so the YTD must be accurate from the migration date.
Request the data from the vendor in any format they support, even a PDF or printed report. Failing that, extract it from your EPFO member portal and ESIC portal for PF/ESI data, and manually compile employee details from salary slips and offer letters. It takes longer, but the data exists in multiple places if you know where to look.
They should not, if done correctly. The salary amount, PF deduction, TDS, and leave balance on their first payslip from the new system should match what they would have received from the old one. The only visible change is the payslip format and, if the new system has one, access to an employee app or portal.
No. ESIC and EPFO track contributions by employer establishment code and employee UAN/IP numbers, not by which software generated the challan. As long as contributions continue uninterrupted and the correct UAN/IP numbers are used, neither body requires notification of a software change.
