Headcount planning is deciding who you'll hire, when, and what each role really costs, then checking that plan against your cash runway before you make any offers. For most SaaS companies people are the largest expense, so the hiring plan is the single biggest driver of burn and runway. Do it with fully-loaded costs (not base salary), phase hires to milestones, and treat every offer as a runway decision.
The fastest way to run out of money isn't one bad quarter, it's a hiring plan that looked affordable on base salaries and turned out not to be. Here's how to build one that survives contact with your bank balance. Model yours as you read with the free hiring plan template and employee cost calculator: it works out each role's fully loaded cost from salary and US state with 2026 employer tax rates, lays out 24 months of hires, and shows how much runway one more hire costs and how much new revenue would make it runway-neutral. It comes with an Excel version.
Use fully-loaded cost, not base salary
The number that matters is the fully-loaded cost of a role: base salary plus employer payroll taxes, benefits, software, equipment, recruiting and a share of overhead. For a US hire in 2026, employer taxes and benefits alone add about 13% to 19% at salaries between $80,000 and $150,000 with single health cover (a $150,000 engineer in California costs $170,181 a year before equipment, software and recruiting); the employee cost calculator shows every line, and the payroll cost calculator covers people abroad by country. Planning on base alone is the most common headcount mistake: you budget the salary, the real monthly bill lands higher, and your runway is shorter than the spreadsheet promised. Plan with the loaded number and the runway you model is the runway you'll actually get. To see a hiring plan inside a full 12-month budget with revenue, other costs and cash, use the SaaS budget template.
Headcount is the lever that moves runway
For most SaaS companies, people are the largest line in the budget; in the calculator's default example, loaded payroll is about two thirds of spend in the first month. That makes the hiring plan the dominant input to burn and runway (check it against ARR per employee so hiring does not outrun revenue), bigger than hosting, tools or marketing. Two extra engineers can quietly shorten runway by months. So every offer is really two questions: "can this person add value?" and, just as important, "does the payoff land before the cash does?" A hire that pays back in nine months is a very different decision at 24 months of runway than at ten.
When to make the key hires
Sequencing matters as much as headcount. A few rules of thumb founders lean on:
- First sales hire, after you have a repeatable way to win customers, not before. Hiring sales to find product-market fit usually just burns cash faster; hire to scale a motion that already works.
- First dedicated finance help, often a fractional CFO or a tool before a full-time hire. The modelling, forecasting and board-prep work comes before you can justify a senior finance salary.
- First manager, when you personally become the bottleneck on a function, not on a fixed headcount trigger.
- Backfill vs. new bets, separate "keep the lights on" hires from "new growth bet" hires. The second kind should have a thesis and a payback window.
These are guides, not laws, your motion and market decide the exact timing. The point is to hire against milestones, not against a calendar or a fundraise you haven't closed.
Tie every hire to runway
Before you sign an offer, run the plan through the numbers: what does total payroll become, what's the new monthly burn, and how many months of runway does it leave? Seed rounds are commonly sized for about 18 months of runway and Series A rounds for about 24 (see the stage benchmarks in our burn and runway guide), so a hiring plan that drops you well below that is really a decision to raise sooner. Modelling it first turns a gut call into a deliberate bet: the hiring plan calculator compares runway with and without a specific hire and gives the monthly revenue that hire would need to bring in to be runway-neutral.
Common headcount-planning mistakes
- Budgeting base salaries instead of fully-loaded costs.
- Hiring ahead of revenue on the assumption the round will close, before it has.
- Front-loading sales before the acquisition motion is repeatable.
- Ignoring the ramp, new hires cost from day one but rarely produce for a quarter or more.
- Planning headcount without a runway check, so the plan and the cash never meet until it's tight.
Frequently asked questions
What is headcount planning?
Deciding which roles you'll hire, in what order and by when, and what each costs fully-loaded, then checking the plan against your cash runway before making offers. It's how you keep hiring and burn in sync.
What is a fully-loaded cost per employee?
Base salary plus employer taxes, benefits, software, equipment and overhead. For a US hire, employer taxes and benefits alone add about 13% to 19% at salaries between $80,000 and $150,000 in 2026 with single health cover, in the six states our calculator lists. Always plan headcount on the loaded figure, since that's what actually leaves your bank account.
What percentage of SaaS costs is headcount?
For most SaaS companies people are the largest single cost, which is why the hiring plan is the biggest driver of burn and runway. Check your own share in the SaaS budget template, which splits payroll from other spend month by month.
When should a SaaS startup make its first sales hire?
Once you have a repeatable way to acquire customers. Hiring salespeople to discover product-market fit tends to burn cash; hire to scale a motion that already works.
How do I know if I can afford a hire?
Add the role's fully loaded cost to every month from its start date and recompute runway. If it pulls runway in before you can reach your next milestone or round, the hire is really a decision to raise sooner, so plan for both. The hiring plan calculator does this for one extra hire and also shows the new monthly revenue that would make the hire runway-neutral.
Plan headcount in Adlega
The hiring plan calculator gives you 24 months of loaded payroll, burn and runway for a given plan. Adlega goes further, phase hires over time, tie them to a driver-based model with a rolling 36-month forecast, and see the month-by-month impact on cash and runway, with the AI CFO flagging when a plan pushes runway too tight. Try Adlega free.
Related: burn rate & runway, scenario & what-if calculator, fractional CFO or a tool?, and build a SaaS financial model.