How to Tell If a Salary Offer Is Fair (Using Real Market Data)

Around 60% of workers accept the first salary offer they receive without negotiating, according to research published by Salary Finance. A significant portion of them leave money on the table — not because the offer was reasonable, but because they had no reliable reference point to judge it against. Knowing how to tell if a salary offer is fair is not a soft skill. It is a data exercise, and it has a clear methodology.

Why gut feeling fails: the case for percentile benchmarking

Most people benchmark a salary offer against one of three things: their current salary, what a friend earns, or a number they saw on Glassdoor. All three are unreliable.

Your current salary reflects one employer's historical view of your value, not the current market. A friend's salary is a sample size of one, in a specific company, negotiated under specific conditions. Glassdoor figures are user-reported and systematically skewed toward respondents who are dissatisfied or proud of what they earn — neither group is representative.

Government statistical agencies collect wage data at scale, under legal obligation, from employers rather than employees. That data is structured in percentiles:

• p25 (25th percentile): the salary below which a quarter of workers in that role and location earn
• p50 / median: the midpoint of the distribution
• p75: the salary above which only a quarter of workers earn
• p90: top-decile earnings

An offer that lands between the median (p50) and p75 for your role, experience level, and location is broadly fair. An offer below p25 is weak. An offer at or above p75 is strong, and at p90 it is exceptional.

For example, according to ONS ASHE 2024 data, the median gross annual salary for software developers in London sits in the low-to-mid £70,000s, with p75 approaching £90,000. An offer of £65,000 for a mid-level London developer is not obviously unfair — but it is below median, and worth flagging before you sign.

How to tell if a salary offer is fair: the four-part check

Evaluating a salary offer fairly means looking at four components together, not just the base salary number.

1. Base salary vs. market percentile This is the primary benchmark. Take the base salary offered and locate it within the distribution for your job title, location, years of experience, and industry. BLS Occupational Employment and Wage Statistics (US) and ONS ASHE (UK) both publish this by occupation and geography. For Germany, Destatis publishes earnings structure data by sector and qualification level.

2. Bonus and variable pay A base salary of £55,000 with a guaranteed 20% annual bonus is economically equivalent to £66,000. Compare total cash compensation to market, not just base. Where bonuses are discretionary or performance-dependent, apply a discount — typically 50–70% of the stated target is a conservative real-world expectation.

3. Equity For roles at startups or public companies that include equity (RSUs, options, ESOP), the valuation matters but is inherently uncertain. For RSUs at publicly traded companies, current market value is real. For options at private companies, treat the value as close to zero for benchmarking purposes unless you have specific evidence of imminent liquidity.

4. Location-adjusted cost of living £70,000 in Manchester has substantially more purchasing power than £70,000 in London. Similarly, $120,000 in Austin, Texas goes further than $120,000 in San Francisco. BLS regional wage data and Statistics Canada's Labour Force Survey both disaggregate by metropolitan area. When comparing offers across cities, always adjust for location.

How to evaluate a job offer covers the full framework in more detail, including non-monetary benefits and career trajectory factors.

Red flags that suggest an offer is below market

Some patterns in job offers reliably indicate that the base salary is below what the market supports:

• The offer arrives with urgency. "We need an answer by tomorrow" prevents you from doing market research. That pressure is not accidental.
• The employer avoids naming a salary range before the offer stage. Companies that know they pay competitively generally advertise it. Those that obscure compensation until a late stage are more likely to make below-market offers.
• The offer is framed relative to your current salary, not market rates. "This is a 10% increase on what you're earning" is not a market argument. It is an anchor that benefits the employer.
• Benefits are heavily emphasised over base salary. Free lunches and gym memberships are worth a few hundred pounds per year. They do not compensate for a salary that is £8,000 below market.

For a fuller treatment, job offer red flags to watch for covers the most common tactics used to obscure below-market offers.

Role-specific benchmarks: where to find reliable data

Different sources suit different roles and geographies:

These datasets are public and free but are not always easy to navigate. You need to match your job title to the correct SOC (US) or SOC/ISCO (UK/EU) code, filter by region, and then read the correct percentile column. For specific roles, software engineer salary benchmarks London shows how that process works in practice.

What to do if your offer is below market

If your offer falls below median for your role and location, you have three options: negotiate, decline, or accept with clear eyes.

Negotiating is statistically likely to succeed. Multiple surveys — including data from Jobvite and LinkedIn — show that over 80% of hiring managers have room to move on salary, and the majority of candidates who negotiate receive an improved offer. The key is to anchor to market data, not personal need. "According to ONS ASHE data, the median for this role in this city is £X" is a far stronger argument than "I was hoping for more."

How to negotiate your offer lays out a step-by-step approach, including specific scripts for the negotiation conversation.

If the employer cannot move to at least median, that signals either a constrained budget or a deliberate policy of underpaying. Both are worth factoring into your decision about the role.

Frequently asked questions

How accurate are government salary datasets for benchmarking job offers?

Government datasets like ONS ASHE and BLS OEWS are the most statistically rigorous salary data available. They are based on mandatory employer reporting, large sample sizes (ASHE covers around 180,000 employee records annually), and consistent methodology. The main limitation is lag: most surveys are published annually and reflect the previous year's data. In fast-moving sectors, p75 figures may understate current market rates by 5–10%.

Should I include equity when deciding if an offer is fair?

For public company RSUs, yes — include the current fair market value of the vesting schedule in your total compensation calculation. For private company options, treat the equity value conservatively. The base salary and cash bonus should still be at or near market even without attributing value to illiquid equity.

What counts as a "fair" salary offer versus a "strong" one?

An offer at or above the p50 (median) for your role, location, and experience level is fair. An offer at or above p75 is strong. An offer at or above p90 is exceptional. Below p25 is weak by any reasonable measure and warrants either negotiation or walking away. The exact thresholds vary by role scarcity — in high-demand technical roles, companies routinely offer above p75 to compete.

Is total compensation or base salary more important to compare?

Total compensation is the economically correct comparison, but base salary matters independently for two reasons: salary-based benefits (pension contributions, life insurance multiples) are usually calculated as a percentage of base, and future raises are typically anchored to your starting base. A high bonus with a low base locks you into a structurally weaker position over time.

You now have the framework to evaluate any offer against real market data rather than guesswork. CompVerdict — instant job offer checker automates the entire process: enter your offer details, and it benchmarks your salary against official government data from ONS, BLS, Destatis, and nine other sources, returning a verdict — Strong, Fair, Slightly Below Market, Below Market, or Significantly Below Market — in under 30 seconds. No sign-up required. Check your offer at compverdict.com before you reply to the hiring manager.