Sources & assumptions
Every number here can be traced to something
Four classifications, applied consistently across every calculator: a published UK statutory rate, a claim Aslan publishes itself, a figure you entered, or an illustrative assumption we chose and you can change. Tax year 2025/26. Aslan content verified September 2026.
Assumption register
The full register
Filter by classification. If a row is illustrative, the model does not treat it as a fact — and neither should your business case.
| Assumption | Value | Classification | Note & source |
|---|---|---|---|
| Employer National Insurance rate | 15% | Government / statutory | Secondary Class 1 NIC rate on earnings above the secondary threshold. www.gov.uk· verified 2025/26 |
| Employer secondary threshold | £5,000 | Government / statutory | Annual earnings above which employer NIC becomes payable. www.gov.uk· verified 2025/26 |
| Employee National Insurance (main rate) | 8% | Government / statutory | Primary Class 1 NIC between the primary threshold and upper earnings limit. www.gov.uk· verified 2025/26 |
| Basic rate income tax | 20% | Government / statutory | Applied to earnings between the personal allowance and higher-rate threshold. www.gov.uk· verified 2025/26 |
| Trivial benefit exemption | £50 | Government / statutory | Per-gift limit for the trivial benefits exemption. Conditions apply — not every reward qualifies. www.gov.uk· verified 2025/26 |
| Salary sacrifice participation | 85% | Illustrative assumption | Share of pension-enrolled employees expected to remain in a sacrifice arrangement. Editable. |
| Employee adoption of a new module | 60% | Illustrative assumption | Modelling placeholder for employee take-up. Aslan does not guarantee adoption. Editable. |
| Fully loaded HR hourly cost | £32 | Illustrative assumption | Used to convert saved administration hours into money. Editable. |
Claims ledger
What Aslan publishes, quoted exactly
We quote rather than paraphrase, so nothing drifts between the source and the slide.
“Employees use Aslan 30+ times a month on average.”
Verified on aslan.ioaslan.io“Getting £100 more to an employee now costs you £180–250 through payroll.”
Verified on aslan.ioaslan.io“Aslan's reward model delivers more value to your people, faster and 3x more effectively than compensation.”
Verified on aslan.ioaslan.io“Cut the impact of the national insurance rises by a third.”
Verified on aslan.ioaslan.io“Aslan's fully managed service means no need to change your pension provider.”
Verified on aslan.ioaslan.io“Seamlessly buy and allocate points to employees, often tax-free under the Trivial Benefits exemption.”
Verified on aslan.ioaslan.io“There are no FX fees when using the Aslan card abroad, so they earn points even on holiday.”
Verified on aslan.ioaslan.io“Employees can take control and choose when and how they get paid, for free — with responsible limits set by our clients.”
Verified on aslan.ioaslan.io
Limitations
What this model cannot tell you
It does not know Aslan's price
Aslan publishes no price list or tiers — pricing is set on enquiry. Payback and ROI therefore appear only when you enter a platform cost yourself.
It does not know your Roarwards rate
No headline reward rate is published. The rate in every card calculation is an illustrative input that you should replace with your contracted figure.
It cannot promise a retention improvement
Retention value is shown as the worth of one percentage point at your own turnover and replacement cost — a scenario to argue, never a saving to bank.
It does not decide tax treatment
Trivial Benefits eligibility, salary sacrifice and National Minimum Wage floors depend on your circumstances. Every calculator says so at the point of the number.
It has no implementation timeline
Aslan publishes no standard onboarding duration, so we show published customer evidence instead of inventing weeks.
It is a model, not an audit
Averages across a workforce are not the same as employee-level payroll data. Validate a shortlist of real records before board sign-off.