Payroll was the last major business system to move to a subscription service, for two sound reasons: it holds the most sensitive data in most organisations and it has deadlines that cannot slip. Both are now well handled by serious providers, and both remain the right questions to ask because the answers still vary.
What genuinely improved
Statutory rates and thresholds arrive without a project, which removes a recurring source of error that installed payroll software suffered from badly. Access for a distributed finance team, and a record that survives losing an office, are the other two. For payroll the automatic updates are the largest of the three by some distance.
What got sharper rather than better
Credential risk. Payroll fraud increasingly takes the form of somebody changing bank details rather than breaking anything, and a login reachable from anywhere makes the attempt cheap. Controls on changing payment details, ideally with a second person confirming out of band, matter more than any technical security feature in the product.
What does not move to the vendor
The filings remain the employer's responsibility in most arrangements, and what varies is what the contract says the provider covers if they cause a failure. Read that clause rather than the sales page. Retention duties also stay with you, so confirm the service keeps history as long as you owe it.
Questions people ask about payroll saas
Is subscription payroll less secure?
Not inherently, and usually more secure than an unpatched server. The risk moves to accounts and change controls, which you manage.
Who is liable for a missed filing?
Generally the employer, with the contract deciding what a provider covers when they caused it. This is the clause worth reading first.
What happens on an outage at pay day?
Ask before signing. A credible answer names an escalation; a vague one is telling you there is no plan.