Stop Calculating Payslip Deductions by Hand

Most small teams start payroll in a spreadsheet, and for a while it works. Then someone joins on the 18th of the month, an employee takes four days unpaid leave, and the formula that worked fine for a full month of standard pay suddenly needs a manual override. A few of those overrides later, nobody fully trusts the sheet anymore, and every payday starts with someone quietly re-checking last month's numbers before trusting this month's.

Why spreadsheet payroll degrades as the team grows

A spreadsheet doesn't enforce anything — it just calculates whatever formula is in the cell, and every one-off case (a joiner, a leaver, an absence, a bonus) is a manual edit that has to be remembered and applied correctly every single month. At five employees that's manageable. At fifteen or twenty, with different join dates and the occasional unpaid day, the odds that one cell gets missed or overwritten climb fast — and the failure mode isn't a visible crash, it's a payslip with a quietly wrong number that nobody notices until the employee does.

What a payslip calculation actually needs to account for

Getting from a basic salary to a correct net payslip means handling several things consistently, every month, for every employee:

• Who was actually active that month. An employee who joined after the month ended shouldn't get a payslip for it; one who joined mid-month often should, depending on your policy — but the system needs to apply that rule the same way every time, not rely on someone remembering.
• Absent-day deductions. A day of unpaid leave should reduce pay by a consistent, defensible fraction of the salary — not a rounded-off guess.
• Provident fund or similar statutory-style deductions. Usually a fixed percentage of basic salary, but easy to apply to the wrong base (gross instead of basic) if it's being typed into a formula by hand each time.
• Rounding. Payroll math done in rupees-and-decimals is exactly where paisa-level rounding drift creeps in across dozens of employees — small individually, embarrassing in aggregate.
• A record that doesn't change after the fact. If someone's salary is revised in October, November's payslip should use the new figure — but September's already-issued payslip should still show what was actually paid then, not silently recalculate.

The two mistakes that show up most often

The first is running payroll twice for the same month by accident — a copy-pasted formula or a re-run script that generates a second payslip for someone, which then has to be manually caught and deleted before anyone notices two payments. The second is a salary change retroactively altering an old payslip, because the formula pulls "current salary" live instead of recording what was actually paid at the time — which turns a routine raise into a discrepancy in three months of back-records.

What a small, purpose-built payroll tool changes

Our Payroll & Payslip Generator is built specifically around these failure points rather than around general spreadsheet flexibility. Running payroll for a month is one click, and running it twice for the same month never creates a duplicate — it's blocked at the data level, not by someone remembering to check first. Only employees who were active and had joined by month end are included automatically. Absent days, bonuses and other deductions are entered per employee, provident fund is calculated as a configurable percentage of basic salary, and every amount is worked out in paise internally so totals add up exactly instead of drifting by a rupee here and there across a large team.

Payslips move through a draft, final, paid workflow: a draft can still be fixed if something's wrong, but once it's marked final the numbers are locked — a later salary change never reaches back and alters it. Each payslip prints cleanly, and the dashboard shows the month's total payable at a glance.

It's worth being direct about what this is not: a statutory compliance system. It doesn't calculate income tax (TDS), professional tax, ESI or employer PF contributions, generate Form 16 or challans, or prorate a joining month automatically. For a small team that needs correct, consistent monthly payslips without those statutory filings built in, that scope is usually exactly right — and it's PHP and MySQL, so it runs on ordinary shared hosting and the schema is open to extend if your business needs grow into it.

FAQ

Does this calculate income tax or PF challans?

No. It calculates a provident-fund-style deduction as a configurable percentage of basic salary, but it does not generate TDS, ESI, professional tax or statutory filing documents. Those obligations need to be handled separately, typically by an accountant familiar with your state and employee count.

What happens if I give someone a raise partway through the year?

Update their salary whenever the raise takes effect. Every payslip already generated keeps the figure it was actually paid at; only payslips run after the change use the new salary. Nothing recalculates retroactively.

Can I run payroll for the same month twice by mistake?

No — this is enforced at the database level, not left to memory. Running the monthly payroll action again for a month that's already been run does not create duplicate payslips.