Sales Commission Calculator
Compute total earnings from a two-tier commission structure, including base salary, tiered commission rates, and a quota achievement bonus. Use it to project monthly income or compare compensation plans before accepting a sales role.
About this calculator
Sales compensation typically combines a base salary with performance-based commissions that accelerate once a threshold is reached. A two-tier structure pays a lower commission rate (commissionRate1) on sales up to a quota (tier1Threshold), then a higher rate (commissionRate2) on every dollar above that threshold — incentivizing reps to push past their quota. A quota bonus adds a lump sum when total sales meet or exceed the threshold. The formula is: Total Earnings = baseSalary + (min(salesAmount, tier1Threshold) × commissionRate1 / 100) + (max(0, salesAmount − tier1Threshold) × commissionRate2 / 100) + (salesAmount ≥ tier1Threshold ? quotaBonus : 0). This structure rewards top performers disproportionately, a design feature known as accelerated commission.
How to use
Suppose base salary = $3,000/month, total sales = $80,000, first-tier commission = 5% up to $50,000, second-tier = 8% above $50,000, and quota bonus = $500. Tier 1 commission: min($80,000, $50,000) × 0.05 = $50,000 × 0.05 = $2,500. Tier 2 commission: max(0, $80,000 − $50,000) × 0.08 = $30,000 × 0.08 = $2,400. Quota bonus: $500 (since $80,000 ≥ $50,000). Total = $3,000 + $2,500 + $2,400 + $500 = $8,400 for the month.
Frequently asked questions
How does a tiered commission structure differ from a flat commission rate?
A flat commission pays the same percentage on every dollar sold, regardless of volume. A tiered structure pays a lower rate on initial sales and a higher accelerated rate once a threshold is crossed. This design benefits high performers disproportionately — a rep who hits 160% of quota earns far more than twice what a rep at 80% of quota earns. Tiered structures are commonly used in B2B and SaaS sales to align incentives, motivate top performers, and minimize overpayment to reps who miss quota.
What is a quota achievement bonus and how does it affect total commission earnings?
A quota achievement bonus is a lump-sum payment triggered when a sales representative reaches or exceeds a defined sales target — the tier1Threshold in this calculator. Unlike commission, which scales continuously with sales volume, the bonus is all-or-nothing: you either earn it or you don't. This binary incentive creates a strong motivation to close deals at the end of a period. In the worked example above, the $500 bonus represents an additional 6% on top of commissions, making the final push to quota financially significant.
How should I use this calculator to compare two different sales compensation plans?
Run the calculator twice using identical sales figures but each plan's different parameters. Pay close attention to how the tier threshold and commission rates interact at various performance levels — for example, enter sales at 80%, 100%, and 130% of quota to see how each plan pays at different performance bands. A plan with a higher base but lower commission rate may be safer in a slow month but limit upside. A plan with a lower base and higher accelerated rate rewards strong performers more. This comparison is especially valuable before accepting a new role or negotiating an OTE structure.