HR and payroll software cost: self-hosted open source vs SaaS

Self-hosting removes per-employee subscription fees, but it moves cost into hosting, implementation, localization, integrations and internal time, so the saving depends on headcount, countries and how much change you need. ERPNext itself is free under GPL-3.0, and the ERPNext pricing page lists Frappe Cloud hosting from 5 US dollars per month for shared site hosting, which shows that hosting can be a small line item compared with payroll and integration work. Odoo is different: its Community edition is free under LGPL-3.0, but payroll and the Enterprise features you need may be licensed per user. Ask every vendor and partner to split the three-year cost into one-time and recurring lines before you compare totals.

An HR team can own day-to-day administration, such as employee records, leave approvals and reports, but payroll setup, hosting, upgrades, security patches and integrations usually need technical staff or a partner. The Frappe supported versions policy says that customers must be on a listed version and subscribed to a matching Frappe Cloud support plan to receive warranty coverage from Frappe, so support terms matter as much as software terms. Confirm which skills you already have in platform engineering, database operations and payroll localization, and write down which tasks each team owns before you decide.

Duration depends mainly on the number of countries and payroll rules, the state of your employee data, the number of integrations (accounting, identity and time capture), and how many approval and leave policies must be configured. Data cleansing often takes longer than configuration, and payroll parallel runs add time because each cycle must be checked before cutover. Ask any partner for a written scope with phases, dependencies and acceptance criteria, because a fixed-scope plan is the clearest basis for a timeline. Do not accept a duration that is not tied to a listed scope.

A partner needs a written description of the countries, payroll rules, employee populations, leave and attendance policies, integrations and hosting constraints before it can scope the work. Provide sample payslips, current payroll calendars, a data extract from your existing HR system, your identity provider details and your retention requirements. The quality of these inputs is the largest single factor in whether a quote is firm or carries large contingencies, so ask the partner to list every assumption it makes about your data.

Upgrades add recurring effort even when the software is free, because each major version needs testing of payroll calculations, custom scripts and integrations. Odoo's upgrade documentation says that on Odoo Online and Odoo.sh major version upgrades are mandatory every two years, and that on-premise use of the upgrade service requires an Enterprise subscription. Odoo standard support covers the first three years after a major release, with security patches only during standard support, so an older version can become a cost and risk item. For Frappe, confirm which major version is supported and the maintenance plan that applies to it.

Not necessarily, because the Community edition is open source under LGPL-3.0 and includes the HR application, but the answer depends on which Enterprise features you need. Odoo's pricing page says that only the Custom plan can be hosted on Odoo.sh or on-premise, and only that plan includes multi-company, Odoo Studio, external API access and custom modules. Check whether payroll localization, mobile apps, upgrade service or support is part of your requirement, and ask the vendor for a written list of what each option includes for your country and user count.

Compare total cost over the same term, scope and user count, including every item the SaaS vendor treats as optional. Ask for the price per employee, what counts as an employee, which countries and payroll runs are included, data export terms, support levels, integration fees, and the cost of the first implementation. Add the self-hosted costs for hosting, localization, integrations, your internal HR and IT time, support and upgrades, and then compare both totals in one spreadsheet. Ask both sides to confirm their assumptions in writing so the comparison can be checked later.

Yes, when the scope, deliverables and timeline are agreed in writing before work starts, the implementation portion of the cost is known in advance. DeployOpen works on fixed-scope engagements, so the buyer sees the work included, the deliverables each phase produces and the conditions under which the scope changes. Predictability covers the build and rollout only. Licenses or subscriptions for an edition, hosting, and the time HR and IT staff spend on reviews and testing still need their own estimates. Ask the partner to separate these lines in the quote so each one can be tracked.

Confirm how a change request is raised, priced and approved before any work starts. A written change process should state who can request a change, how the partner estimates its effect on scope, cost and timeline, and who signs off before the work begins. Ask whether changes to payroll rules, country-specific localization or integrations are priced separately from configuration adjustments. Also confirm how changes discovered during testing are handled, since a payroll rule that differs from the documented policy is a common source of unplanned work.

Change requests tend to cluster around requirements that were not settled before the build started. The most common areas are payroll rules for each country, leave policies with carry-over or accrual exceptions, attendance capture methods, approval chains and the fields required for integrations with accounting and identity systems. Illustrative example: a company that discovers a leave accrual rule only after testing will need the workflow, reports and balance migration rebuilt. Completing the requirements checklist before the quote reduces this risk.

Several costs continue after go-live and should be modeled as recurring. These include hosting or infrastructure in your own cloud account or data center, edition fees where a commercial edition is used for payroll or support, support or retainer agreements, and the internal time for applying upgrades and testing them before each release. Odoo, for example, publishes standard support windows for each major version, and ERPNext requires a matching support plan for vendor warranty coverage. Ask the partner which costs are one-time and which recur, and for what period each recurring item is quoted.

Often yes, but only if the handover includes documentation, access and a tested operating routine. The handover should cover configuration decisions, integration logic, backup and restore procedures, upgrade steps and the runbook for payroll cycles. Ask the partner what is documented as a deliverable, which administrator access is transferred, and how knowledge transfer is verified. Your internal team will still need someone who understands payroll rules and the chosen platform, and that role should be budgeted as recurring staff time rather than assumed to be absorbed.

A useful quote lists each deliverable, its acceptance criteria, the systems in scope, the assumptions it depends on and the exclusions. It should name the countries and payroll rules covered, the number of integrations, the data migration volume and the testing approach. It should also state what the buyer provides, such as subject matter experts, test data and sign-off time, because delays in those inputs often move timelines. Finally, ask how change requests, support after go-live and upgrade work are priced, and whether each is one-time or a retainer. DeployOpen does not publish a price list, and each quote follows from the written scope.

Migration and integrations are usually the least predictable parts of an HR rollout because they depend on the quality of the source data and the systems involved. Cost rises with the number of record types, historical depth, the number of systems feeding or receiving data and the amount of cleansing needed. Connections to payroll providers, accounting or identity systems each require mapping, testing and monitoring. Ask the partner to inventory the source systems, estimate the cleansing effort in writing and state whether migration testing is included in the fixed scope or priced as a change.

Not automatically. Self-hosted ERPNext and the Frappe HR app are free to run under their open source licenses, and OrangeHRM and Odoo Community offer open source cores. However, Odoo Enterprise requires a subscription for features such as upgrades and on-premise use, and vendor support or a Frappe Cloud plan may be needed for warranty coverage. Compare the total cost over the planned operating period, including hosting, support, localization and staff time, against per-employee SaaS pricing. Confirm each licensing condition with the vendor before deciding.