Is what I type saved or sent anywhere?

No. Every tool works out its answer in your browser. Nothing you type is sent to us, stored or tracked by the tool.

Where do the rules come from?

From the official text: the GST Acts, rules and CBIC notifications, the labour codes and EPFO and ESIC circulars, and the accounting standards. Each tool lists the rules it applies, with the source and the date we last checked it.

Can I rely on the answer for a filing?

Use it as a careful estimate. Tax and labour rules change and every business has its own facts, so check anything you file or pay with your chartered accountant.

Can PrimoERP do this for every invoice and every employee?

That is what PrimoERP is for: GST on every invoice, stock and payroll worked out as your team records its work, with your accounts in one system. Book a free demo to see it with your own data.

Free, no signup

Free tools for Indian businesses.

Work out GST, check a GSTIN, see whether e-invoicing applies, make an invoice, and size your stock and salaries. Every tool shows the rule it follows and where that rule comes from.

Book a free demo

Rules from the official text
Worked out in your browser
Nothing is sent or saved

GST and compliance tools.

Work out GST, check a GSTIN, see whether e-invoicing or an e-way bill applies, and keep the due dates.

GST calculatorAdd or remove GST on one amount or a whole bill, split into CGST, SGST or IGST.Read more GSTIN validatorCheck the format and check digit of one GSTIN or a whole list, in your browser.Read more E-invoice applicability checkerWhether your business must issue e-invoices, and the 30-day reporting limit.Read more E-way bill checkerWhether a consignment needs an e-way bill, and how long the bill stays valid.Read more GST late fee and interest calculatorLate fee and interest on a late GSTR-3B, GSTR-1 or GSTR-9, day by day.Read more Compliance calendarGST, TDS, PF and ESI due dates, month by month, to add to your calendar.Read more

Invoices and documents tools.

Make a GST invoice, quotation, purchase order or delivery challan, and download it or the Excel template.

GST invoice generatorA GST tax invoice with every required field, as a PDF or an Excel template.Read more Quotation generatorA quotation with GST, validity and terms, as a PDF or an Excel template.Read more Purchase order generatorA purchase order with GST, delivery and payment terms, as a PDF or Excel.Read more Delivery challan generatorA delivery challan with the details Rule 55 lists, as a PDF or Excel.Read more

Payroll tools.

Salary under the new labour codes, and gratuity, with each rule shown.

Salary calculator (labour codes)CTC to in-hand salary under the new labour codes, with PF, ESI and the employer’s cost.Read more Gratuity calculatorGratuity under the Code on Social Security, with the eligibility rules shown.Read more

Inventory tools.

How much to order, when to reorder, and what your stock is worth.

EOQ calculatorThe economic order quantity, and how many orders a year it means.Read more Reorder point and safety stock calculatorWhen to reorder, and how much safety stock to keep for your lead time.Read more Inventory valuation calculatorFIFO and weighted average (periodic and moving) side by side: closing stock, cost of goods sold, gross profit.Read more

Accounting and business tools.

Depreciation, margins and break-even, and what an ERP would cost and save you.

Depreciation calculatorStraight line and written down value, year by year, under the Companies Act.Read more Margin, markup and break-even calculatorMargin and markup from cost and price, with or without GST, and your break-even point.Read more ERP cost and ROI calculatorWhat an ERP would cost over three years, and the time it could save your team.Read more

About these tools.

Are the tools really free?

Yes. There is no signup, no trial and no limit on how often you use them.

— the PrimoERP team

Come for a free ERP demo. We'll show you your business on one screen.

your free demo voucher

VOUCHER · VALID FOR ONE FREE DEMONO COST

your business, on one screen, in one sitting.

Bring your questions and a rough idea of how you work today. We set up a demo for a business like yours and walk through it with you.

Set up for your industry
Online, at a time you pick
No card, no contract

claim it ↓Book my free demo WhatsApp or call us

[email protected]+91 84609 48357Makarba, Ahmedabad · Mon–Sat, 9:00 AM–6:00 PM IST