Payroll Outsourcing ROI Calculator — In-House vs Vendor Net Savings (FY 2025-26)

How the Calculator Works

The calculator builds two parallel cost stacks — in-house and outsourced — and compares them annually. Each stack reflects realistic cost components observed across our client engagements during FY 2025-26 with the four Labour Codes effective from 21 November 2025.

In-House Cost Stack

Outsourced Cost Stack

Decision Outputs

Net Savings = In-House Cost − Outsourced Cost. Savings % = Net Savings ÷ In-House Cost. Break-Even Headcount = the employee count at which the two stacks cross. Verdict = four-band recommendation: Strongly Outsource (savings ≥ 30%), Outsource (savings 10-30%), Hybrid Toss-Up (savings -10% to +10%), Stay In-House (cost increase > 10%).

Caveats

The calculator outputs a financial comparison. Non-financial factors include: vendor data security and DPDP Act compliance, vendor reputation and stability, ease of exit at contract end, integration with existing HRMS, multi-state expertise, and culture fit with internal HR. A vendor offering 5% lower cost but with poor support quality should be deprioritised over a slightly costlier vendor with strong references.

In-House Payroll Cost — Hidden Components

In-house payroll cost is rarely captured fully in finance dashboards. Most companies track only the dedicated payroll executive's salary and miss the indirect components. The five-component framework below captures all material costs.

Component 1: Payroll Executive Labour

The dedicated person or persons running payroll. For under-50 companies, typically a fractional executive (30-50% FTE allocation) at ₹3-6 lakh annual cost. For 50-200 companies, one dedicated person at ₹6-10 lakh. For 200-500, two people at ₹15-20 lakh combined. For 500+, three to five people scaling. Include the loaded cost — basic + statutory + benefits + overhead — not just CTC. Use our Employee Total Cost Calculator for the loaded figure.

Component 2: Payroll Software

India's payroll software market in 2026 has clear pricing tiers. Basic platforms (Razorpay X Payroll, Zoho Payroll) start at ₹50-100 PEPM. Mid-tier platforms (GreytHR, Keka, Paybooks) run ₹100-200 PEPM with HR features bundled. Enterprise platforms (Darwinbox, SAP SuccessFactors) cost ₹300-800 PEPM with full HCM functionality. Software fees scale linearly with employee count, providing no economies of scale. Refer to the EPFO Unified Portal for direct PF filing — many companies attempt to skip dedicated payroll software using free portals, but this fails above 30 employees.

Component 3: External CA Advisory

Even with a dedicated payroll executive, most companies retain external CA support for compliance review, statutory return sign-off, and audit assistance. Quarterly review fee: ₹15,000-₹50,000 depending on complexity. Year-end audit support: ₹50,000-₹2,00,000. POSH committee external member: ₹25,000-₹50,000 annual. The CA's role is risk reduction — catching errors before they become penalties.

Component 4: Compliance Penalty Reserve

The expected value of late filing penalties and interest accruing across the year. Even well-run in-house teams encounter occasional misses — late TDS deposits during March year-end rush, missed PT payments during executive transitions, delayed PF challans during long weekends. Reserve realistically based on last 12 months' actual experience. SMEs typically reserve ₹20,000-₹50,000; mid-market ₹50,000-₹2,00,000.

Component 5: Management Oversight

The proportionate time of CFO, HR head and senior management spent reviewing payroll, signing approvals, addressing employee queries, and managing escalations. Typically 10-20% of the dedicated executive's time-equivalent at senior management cost rate. For a CFO drawing ₹40 lakh CTC spending 5% time on payroll = ₹2 lakh annual cost allocated. This component is universally under-counted in finance dashboards.

Vendor Cost Stack — What You Actually Pay

Vendor pricing in India follows a Per-Employee-Per-Month (PEPM) model, with three standard service tiers. Headline PEPM is the start of the conversation, not the end — actual annual cost includes setup fees, multi-state surcharges, off-cycle processing, and integration costs.

Service Tier Pricing 2026

Multi-State Surcharge

Operations across multiple states attract a 15-30% surcharge on PEPM. Each state has different professional tax slabs, Labour Welfare Fund schedules, Shops and Establishments Act registrations, and minimum wage rules. Vendors price the additional compliance complexity. The calculator above auto-applies multipliers: 1.0× for single-state, 1.20× for 2-3 states, 1.30× for 4+ states.

Setup & Integration Cost

One-time setup fee covers data migration from existing system, salary structure configuration, parallel payroll run for verification, and go-live. Range: ₹10,000-₹50,000 for SMEs, ₹50,000-₹2,00,000 for mid-market. Often waived for ≥100 employee commitments. Integration with HRMS (Keka, GreytHR) typically free; integration with custom systems may cost ₹25,000-₹1,00,000. Amortise across the expected engagement tenure (typically 36 months) for accurate ROI computation.

Residual In-House Cost

Outsourcing does not eliminate all internal payroll cost. Retain approximately 0.1 FTE for vendor relationship management, employee escalation handling, monthly data validation, and audit liaison. This residual cost typically equals 10% of what the dedicated payroll executive would have cost in-house. The calculator includes this in the outsourced stack.

Decision Tiers by Headcount

The break-even point varies with company size, complexity, and the specific cost components. Below are general guidelines refined by the calculator above.

Tier 1: Under 25 Employees — Outsource Almost Always

For companies under 25 employees, outsourcing is the rational default. The fixed cost of an in-house payroll executive (₹3-6 lakh annual) cannot be amortised efficiently. Vendor pricing of ₹3,000-₹15,000 per month for under-25 employees beats every reasonable in-house configuration. Founder time is too valuable to spend on payroll execution. Compliance errors at small scale create disproportionate distraction from product/market work.

Tier 2: 25-100 Employees — Outsource Usually Wins

The 25-100 range is where outsourcing typically saves 30-40% versus in-house. A dedicated executive becomes economically justifiable but not yet productive at full scale. Software costs scale linearly without economies. Vendors at ₹300-₹500 PEPM (₹7,500-₹50,000 monthly) usually beat the loaded in-house cost. Hybrid models become attractive — basic vendor for processing, internal HR for employee management.

Tier 3: 100-500 Employees — Decision Tightens

Above 100 employees, an in-house payroll team of 1-2 executives can be productive enough to compete on cost. Vendor PEPM × 100 emp × 12 = ₹6-9 lakh annual, against in-house team of ₹15-25 lakh — vendors win on direct cost. But hybrid models — vendor for filings + in-house for processing and queries — often optimal. Multi-state operations swing the calculus toward outsourcing.

Tier 4: 500+ Employees — Hybrid Optimal

Above 500 employees, in-house payroll teams scale to 3-5 dedicated executives. Vendor pricing at ₹400-₹700 PEPM × 500 = ₹24-42 lakh annual is comparable to in-house team cost. Hybrid models are typical: in-house team for processing + employee support, vendor for compliance filings and audit support, separate HRMS platform. Pure outsourcing rare; pure in-house attracts compliance risk concentration.

Tier 5: 2,000+ Employees — Enterprise HCM In-House

Above 2,000 employees, the economics shift to enterprise HCM platforms (SAP SuccessFactors, Workday, Darwinbox) with dedicated in-house teams. Outsourcing partial functions like statutory filings or specific subsidiary payrolls remains common. Total payroll cost as % of payroll typically falls to 0.3-0.5% at this scale.

Vendor Service Tiers Compared

Choose the right tier based on internal capability and risk tolerance. Most Indian SMEs find the Standard tier matches their needs at the right price point.

Basic Tier (~₹250 PEPM)

Limited to salary calculation, payslip generation, and bank transfer file preparation. Statutory compliance — PF challan, ESI, TDS, professional tax filings — remains the employer's responsibility. Best fit when the employer has a strong in-house compliance team and only needs processing automation. Risk: any compliance error attributable to in-house team, not vendor.

Standard Tier (~₹500 PEPM)

The most popular tier. Adds full statutory compliance to Basic — PF Electronic Challan-cum-Return upload, ESIC challan, TDS deduction and Form 24Q filing, professional tax remittance and quarterly returns, Labour Welfare Fund. Vendor takes operational responsibility for accurate filings; employer retains principal compliance liability per EPFO regulations and ESIC norms. Suits companies with internal HR but limited dedicated payroll capability.

Full-Service Tier (~₹1,200 PEPM)

Standard + employee helpdesk for payroll queries, leave and reimbursement management, Form 16 distribution to all employees by 15 June, audit support during income tax / labour audits, and statutory compliance advisory on changes. Best fit for companies without dedicated HR capability — typical buyers include foreign-owned subsidiaries, fast-growing startups, and SMEs preferring zero-touch payroll.

Comparison Across Tiers

Vendor Evaluation Framework

Six-dimension framework for evaluating payroll outsourcing vendors before signing. Each dimension carries roughly equal weight; a vendor scoring poorly on any one should be deprioritised.

Dimension 1: Pricing Transparency

Demand a sample invoice for one employee at your salary band before signing. Verify each line item — base PEPM, multi-state surcharge, off-cycle processing fee, year-end Form 16 charges, audit support hourly rate, integration fees, and any setup fees. Reputable vendors disclose all line items upfront. Hidden fees can add 20-30% to the headline PEPM.

Dimension 2: Compliance Track Record

Ask for client references in your industry and size band. Specifically inquire about late filing incidents in the past 24 months, accuracy rate in payroll calculations, and resolution time for errors. Reputable vendors maintain 99%+ accuracy and 1-2 errors per 1000 payslips. Visit the Income Tax portal to verify the vendor has clean TAN-level compliance.

Dimension 3: Data Security & DPDP Compliance

India's Digital Personal Data Protection Act 2023 has elevated payroll data security from optional to mandatory. The employer remains the data fiduciary regardless of outsourcing — vendors are data processors. Verify vendor's ISO 27001 certification, SOC 2 Type II audit, encryption at rest and in transit, role-based access controls, and breach notification protocol. Multi-tenancy architectures with proper data segregation matter.

Dimension 4: Scalability

Confirm the vendor can handle your projected 3-year headcount growth without forcing a platform migration. Verify multi-state coverage if you operate or plan to operate beyond a single state. Check for multi-entity capability if you have or will have multiple legal entities. Ask about handling of contractor payments alongside employee payroll under unified workflow.

Dimension 5: Response Time SLA

Lock in service levels: 24-hour response for non-urgent queries, 4-hour response for urgent issues, named account manager (not generic ticket queue), monthly QBR / quarterly business review, and clear escalation matrix. Reputable vendors maintain 1 dedicated person per 40-50 client employees for personalized service.

Dimension 6: Exit Clause

Lock in exit terms upfront: 30-60 day notice period, full data portability in standard format (Excel + JSON), no exit penalty, parallel-run support during transition to new vendor or in-house team, retention of historical data for 7 years per Income Tax Act requirements. Vendors with multi-year lock-ins and exit penalties signal weak product-market fit.

Hidden Costs & Risks

Beyond the headline PEPM and obvious line items, several costs can creep into the final bill. Awareness upfront avoids budget surprises.

Off-Cycle Payroll Surcharges

Standard pricing covers one regular monthly payroll cycle. Off-cycle runs — bonuses, severance, mid-month adjustments, retroactive corrections — typically cost ₹2,000-₹10,000 per off-cycle. Most companies need 2-4 off-cycle runs per year. Negotiate inclusion of 2-3 off-cycles in the annual contract, or push the rate down to ₹1,000-₹2,000 per off-cycle.

Compliance Surcharges

Year-end Form 16 distribution: ₹100-₹300 per employee. POSH annual report support: ₹15,000-₹50,000. Income tax audit support: ₹50,000-₹2,00,000 per audit. Labour audit support: ₹25,000-₹1,00,000. Some vendors include all in Full-Service tier; others charge separately. Always confirm in the master service agreement.

Integration Cost

HRMS integration with existing platforms (Keka, GreytHR, custom systems) typically free for standard connectors but ₹25,000-₹1,00,000 for custom integrations. ERP integration (SAP, Oracle) costs ₹1-3 lakh as project. Always test integration during the trial period before committing to the full engagement.

DPDP Act Risk Premium

Under the Digital Personal Data Protection Act 2023, the employer remains the data fiduciary even after outsourcing. Vendors are data processors. A breach at the vendor exposes the employer to penalty up to ₹250 crore under the DPDP Act. Verify vendor's DPDP readiness, breach notification protocol, and indemnity clauses in the contract. This is non-negotiable in 2026.

Vendor Concentration Risk

Single-vendor dependency creates concentration risk. If the vendor faces operational failure, financial distress, or compliance issues, your payroll continuity is impaired. Diversify by maintaining basic in-house capability, retaining 12 months of historical payroll data offline, and having a backup vendor identified in advance. The 2-week parallel-run capability with an alternate vendor is worth the modest extra cost.

Frequently Asked Questions