Commission Calculator

Commission is one of the oldest and most powerful forms of performance-based pay. Whether you are a sales professional trying to understand your pay cheque, a business owner designing a compensation plan, or an HR manager benchmarking rates, this complete guide covers every aspect of commission calculation — from the basic formula to complex tiered structures, tax treatment in both the US and UK, and the legal framework around commission clawbacks and holiday pay.

The Core Commission Formula

At its simplest, commission is calculated with one formula:

Commission = Sales Revenue × Commission Rate

For example, if a sales representative generates £50,000 in sales and their commission rate is 8%, their commission is £4,000. In the US, a car salesperson who closes $30,000 in vehicle sales at a 3% commission rate earns $900 from that deal.

However, in practice commission plans are rarely this simple. Most plans layer in base salaries, thresholds, accelerators, caps, and bonuses that require a much more nuanced calculation. Our commission calculator handles all of these variables simultaneously.

Types of Commission Structures

1. Straight Commission (100% Commission)

In a straight commission arrangement, the salesperson earns nothing unless they sell. This is common in insurance sales, real estate, and some B2B environments. The upside is unlimited earning potential; the downside is zero income during slow periods. In the UK, workers on straight commission must still receive at least the National Living Wage (£11.44/hour from April 2024) when averaged over a pay reference period, meaning an employer may need to make up any shortfall.

2. Salary Plus Commission

The most common structure in corporate sales. The employee receives a guaranteed base salary (providing financial security) plus a commission on top of sales performance. A typical split might be 60% base / 40% variable, or 70/30 for less experienced roles. This structure is standard across UK financial services, telecoms, and technology sales. In the US, software sales reps at enterprise companies frequently earn $80,000–$120,000 base with on-target earnings (OTE) of $160,000–$240,000 including commission.

3. Tiered or Graduated Commission

As a salesperson hits higher revenue thresholds, their commission rate increases. For example:

Tiered structures incentivise overachievement and reward top performers disproportionately. They are widely used in SaaS, B2B technology, and pharmaceutical sales.

4. Residual Commission

Common in subscription-based and insurance businesses, residual commission pays the salesperson an ongoing percentage for as long as the customer they signed remains active. A broker who sells a £500/month insurance policy at 5% residual commission earns £25 every month that customer renews — potentially for years after the initial sale. This model aligns salesperson incentives with customer retention.

5. Gross Margin Commission

Instead of paying commission on revenue, some companies pay on gross profit. This discourages unnecessary discounting. If a product costs £200 to supply and the salesperson sells it for £350, the gross profit is £150. At 20% gross margin commission, they earn £30. This model is common in manufacturing, wholesale, and distribution.

Commission Rates by Industry

Note: UK financial services commission is heavily regulated by the Financial Conduct Authority (FCA). Following the Retail Distribution Review (RDR) in 2013, most financial advisers can no longer receive commission from product providers — they must charge fees directly to clients. Mortgage and insurance brokers are exceptions and can still receive procuration fees.

Commission vs Bonus vs Salary

Salary is fixed, paid regardless of performance. It provides income security but no direct link to output.

Commission is a direct percentage of the value generated — it is variable and directly tied to individual sales activity.

Bonus is typically a discretionary or target-linked lump sum paid periodically (quarterly, annually). A bonus may be triggered by company-wide performance, individual metrics, or manager discretion, unlike commission which is formulaic.

Many modern compensation packages combine all three. A SaaS account executive in London might receive a £60,000 base salary, 8% commission on new ARR, and a quarterly bonus of £5,000 for hitting team targets.

Draw Against Commission

A draw is an advance on future commission earnings, commonly used to help new salespeople during their ramp-up period. There are two types:

• Recoverable draw: The advance must be paid back from future commission. If a rep receives a $2,000/month draw but only earns $1,500 in commission, they owe $500 the following month.
• Non-recoverable draw: The draw acts as a minimum guarantee. If commission falls short, the deficit is forgiven. This is effectively a guaranteed minimum wage supplement.

In the UK, recoverable draws must be handled carefully. The Employment Rights Act 1996 restricts deductions from wages unless the worker has signed a written agreement. Aggressive clawback arrangements can fall foul of minimum wage legislation.

Commission Clawbacks

A clawback is a provision allowing an employer to reclaim commission already paid if certain conditions arise — most commonly if a customer cancels within a defined period (often 3–12 months), or if the sale was found to be fraudulent or in breach of policy. Clawbacks are common in insurance, mortgage broking, and SaaS. In the UK, clawbacks are enforceable if they are clearly documented in the employment contract. The Courts have consistently held that an employer cannot unilaterally impose a clawback — it must be a contractual term agreed in advance.

Tax on Commission – United Kingdom

In the UK, commission is treated as employment income and taxed through the PAYE (Pay As You Earn) system. It attracts:

• Income Tax: At your marginal rate — 20% (basic), 40% (higher), 45% (additional) for 2024/25.
• National Insurance Contributions (NIC): Employee Class 1 NIC at 8% on earnings between £12,570–£50,270 and 2% above that threshold (2024/25 rates).
• Employer NIC: 13.8% on the full commission amount (rising to 15% from April 2025).

Commission is included in gross pay for the purpose of calculating statutory payments such as Statutory Sick Pay (SSP) reference pay and redundancy pay. Importantly, following the landmark Lock v British Gas Trading Ltd [2016] ruling, commission must also be factored into holiday pay calculations. Workers who regularly receive commission cannot legally have their holiday pay calculated on base salary alone — their "normal remuneration" must include the average commission earned over a 52-week reference period.

Tax on Commission – United States

In the US, commission income is classified as supplemental wages by the IRS. Employers have two options for withholding federal income tax:

• Flat rate method: Withhold 22% federal tax on commission payments (37% if total supplemental wages exceed $1 million in a year).
• Aggregate method: Add commission to regular wages and withhold based on the combined amount using the employee's W-4 tax table rate.

In addition, commission is subject to Social Security tax (6.2% on wages up to $168,600 in 2024) and Medicare tax (1.45%, plus an additional 0.9% for high earners above $200,000 single/$250,000 married). State income taxes vary considerably — from 0% in states like Texas and Florida to over 13% in California.

1099 vs W-2 Commission Workers

A significant distinction in US employment law is whether a commissioned salesperson is classified as a W-2 employee or an independent contractor (1099).

• W-2 employees have taxes withheld by the employer, receive employee benefits, and are subject to FLSA minimum wage protections.
• 1099 contractors are responsible for self-employment tax (15.3% covering both employer and employee portions of Social Security and Medicare), must file quarterly estimated tax payments, and can deduct business expenses. They receive no employee benefits.

The IRS applies a multi-factor test to determine correct classification. Misclassifying employees as contractors carries significant penalties. The UK equivalent is the distinction between employed, worker, and self-employed status — reinforced by IR35 rules that apply to personal service companies.

Real Estate Commission in Detail

Real estate is one of the highest-visibility commission sectors in both the US and UK. In the United States, the traditional model has buyers and sellers each represented by an agent, with the seller typically paying a total commission of 5–6% of the sale price — split between both agents. On a $400,000 home, this means $20,000–$24,000 in commission. Following the 2024 NAR settlement, buyer agent compensation structures are changing, with more buyers now negotiating directly with their agents.

In the United Kingdom, estate agents are paid solely by the seller and typically charge 1–3% of the agreed sale price (plus VAT at 20%). On a £350,000 property at 1.5%, the fee is £5,250 plus £1,050 VAT = £6,300 total. Online estate agents such as Purplebricks disrupted this model with fixed fees of £999–£1,999 regardless of sale price.

UK Employment Law and Commission

Key UK legal points for commission earners:

• Commission must be paid on time as part of wages under the Employment Rights Act 1996.
• Commission must be included in holiday pay calculations (Lock v British Gas principle).
• Employers cannot make deductions from commission without prior written agreement.
• Workers on commission-only contracts must still receive at least National Minimum/Living Wage on average.
• Commission earned before termination remains payable even after the employee leaves, unless the contract specifically and clearly states otherwise — and even then, such clauses are often challenged as unlawful penalties.