HR software for SaaS companies: hiring fast, paying equity right and passing SOC 2

Equity, RSUs and payroll: where SaaS companies get tax wrong

Equity is where SaaS payroll gets technical. Mistakes are expensive to unwind.

When restricted stock units vest, the value of the shares is taxable wages to the employee. The employer has to withhold income tax, Social Security and Medicare, and report the income on the W-2. Many companies withhold federal income tax on RSU income using the flat supplemental wage rate of 22 percent, and the rate rises to 37 percent on supplemental wages above $1 million in a calendar year (IRS Publication 15). Employees with large grants are often surprised at tax time when 22 percent turns out to be too little.

Stock options follow different rules. Nonqualified stock options create wage income when exercised, while incentive stock options generally do not create regular income tax at exercise, though they can trigger alternative minimum tax (IRS Topic 427). Your payroll system needs to know which type each employee holds.

In practice, the equity platform such as Carta tracks grants and vesting, and payroll handles withholding. The handoff between the two is where errors live. Ask HR software vendors to show you how vest events get into payroll, how share withholding or sell-to-cover is recorded, and how the income lands on the W-2.

Remote teams across many states

Remote-first SaaS companies collect state tax obligations quickly. Hiring one engineer in a new state usually means registering for state withholding and unemployment insurance there, and possibly local taxes too.

The risk most teams miss is the quiet move. It happens constantly. An employee relocates from Texas to Colorado for personal reasons and tells their manager but not HR. Payroll keeps withholding as if they live in Texas, which has no state income tax. Months later, someone has to fix the Colorado registration, back withholding and a W-2 correction.

Good HR software makes work location a required, employee-confirmed field, flags any change, and alerts payroll when a new state appears. Pair that with clear policies in time-off management, because PTO rules vary by state too. California, for example, treats accrued vacation as earned wages, so “unlimited PTO” and use-it-or-lose-it policies need careful drafting there.

The HR side of a SOC 2 audit

Security teams own SOC 2, but auditors test several controls that live in HR. Expect requests for evidence like this:

If HR evidence lives in email threads, every audit becomes a scavenger hunt. Nobody enjoys that week. A platform that timestamps each step turns audit prep into an export.

Engagement, retention and the cost of a mis-hire

SaaS talent is expensive to replace, and engineers and account executives both leave for reasons managers often miss. Regular pulse surveys give early warning, especially after reorganizations or leadership changes, and help managers act on specific feedback instead of guessing.

The rest of the employee experience matters too: clear goals, regular check-ins and fast expense management for remote employees who buy their own home office gear. Small frictions add up. Remote people feel every one of them.

How Keka fits SaaS companies

Many Keka customers are software and technology companies, including Taazaa, a software development company that cut its payroll time from 168 hours to 1 hour after moving to Keka. Keka runs hiring, onboarding, multi-state US payroll, time off, performance, engagement and expenses on one AI-native data model, so an accepted offer becomes an onboarding plan and a correct first paycheck without retyping.

For SaaS teams specifically, the platform supports remote employees in all 50 states, OKRs and goal tracking for fast-moving teams, and REST APIs and webhooks for connecting identity, equity and finance tools. Keka is covered by SOC 2 and ISO 27001, which makes vendor reviews simpler when your own auditors ask about your HR system.

A note on timing: if you are on a PEO today, the cleanest moment to move is usually right before a big hiring push or at the start of a calendar year, when benefits renewals and W-2 resets line up.

Frequently asked questions

What is the best HR software for a SaaS startup?

The best HR software for a SaaS startup connects recruiting, onboarding, multi-state payroll and offboarding on one employee record, handles equity-related payroll events, and produces the HR evidence a SOC 2 audit needs. Pick it before your post-funding hiring push so you are not migrating payroll mid-growth.

How is RSU income taxed through payroll?

Vested RSUs are taxable wages. Employers withhold income tax, Social Security and Medicare and report the income on Form W-2. Many employers use the 22 percent federal supplemental withholding rate, which rises to 37 percent on supplemental wages over $1 million in a calendar year.

Do startups need HR software or a PEO?

Very early startups often use a PEO to get access to better health insurance. As headcount, states and equity complexity grow, many move to their own HR and payroll platform for more control over benefits, data and policies. The switch is easiest at a calendar year boundary.

What HR controls are tested in a SOC 2 audit?

Auditors commonly sample background checks for new hires, signed acceptance of security policies, security awareness training completion and timely removal of system access after termination. HR software with timestamped workflows makes this evidence easy to produce.

How do remote SaaS teams handle payroll in multiple states?

Each state where an employee works usually requires withholding and unemployment insurance registration. HR software should require a confirmed work location for every employee, flag changes, and alert payroll before the first paycheck in a new state.

When should a startup convert contractors to employees?

Convert a contractor when the relationship looks like employment: full-time work on core products, a manager setting hours, company equipment and no other clients. The Department of Labor looks at the economic reality of the relationship, not the contract label.

Sources

• Gartner, “Gartner Sales Survey Finds 67% of B2B Buyers Prefer a Rep-Free Experience,” March 2026.
• Gartner, “Gartner Survey Finds 69% of B2B Buyers Turn to Sales Reps to Validate AI-Generated Insights,” May 20, 2026.
• US Department of Labor, Wage and Hour Division, Fair Labor Standards Act.
• California Department of Industrial Relations, Overtime FAQ.
• US Department of Health and Human Services, Office of Child Support Services, New hire reporting.
• IRS, About Form 941 and Publication 15 (Circular E).
• G2, Keka reviews, rating and review count checked October 2026.