Assess a worker for auto-enrolment
Eligible, non-eligible or entitled: the 2026-27 thresholds and minimum contributions.
Pension auto-enrolment began on 1 October 2012, when the largest UK employers took on a legal duty to enrol eligible staff into a workplace pension for the first time [1]. By the time the rollout finished in February 2018, more than 10 million workers had been enrolled and over 1.6 million employers had met their duties, reversing a decades-long decline in workplace pension saving [1][2].
The date matters because it anchors a system that has grown far beyond its starting point. What launched as a duty for a handful of very large employers is now an obligation for every UK business with at least one member of staff, backed by minimum contributions that have more than tripled since day one.
This article sets out exactly when auto-enrolment started, how the staging timetable rolled the duty down from the largest employers to the smallest, how the minimum contribution climbed to 8%, what replaced staging for new employers, and the reforms that are set to extend the system further.
Key takeaways
- Auto-enrolment began on 1 October 2012, starting with employers of 50,000 or more staff.
- Existing employers were phased in by size, and the last of them reached their staging date in February 2018.
- Minimum total contributions rose from 2% to 5% on 6 April 2018, then to 8% on 6 April 2019.
- Employers set up after 1 October 2017 have an immediate duty from the day their first member of staff starts, with no staging date.
- The Pensions (Extension of Automatic Enrolment) Act 2023 paves the way to lower the age to 18 and remove the Lower Earnings Limit, though the change is not yet in force.
The legal starting point: 1 October 2012
Auto-enrolment was created by the Pensions Act 2008, which introduced the employer duty to automatically enrol certain workers into a qualifying pension scheme and to contribute towards it [3]. The duty did not begin the moment the Act passed. It commenced on 1 October 2012, and it was switched on gradually rather than all at once [1][2].
The policy answered a specific problem. Workplace pension participation had fallen for years, and too few employees were saving anything at all for retirement. Auto-enrolment reversed the default: instead of asking workers to opt in, it enrolled eligible workers automatically and left them the choice to opt out [2]. That single change in the default is the reason participation rose so sharply.
Why the rollout was staged
Enrolling every worker in the country on the same day was never practical. Pension providers, payroll systems and the National Employment Savings Trust, the government-backed scheme built to guarantee capacity for every employer, all needed time to absorb the volume [4]. So the duty was released in waves, each employer receiving a staging date set by the size of its largest pay-as-you-earn scheme [1].
The staging timetable, from largest to smallest
Staging worked from the top down. The biggest employers, those with 50,000 or more workers, staged first in October 2012, and the timetable then rolled through medium, small and finally micro employers over the following five and a half years [1][2]. The table below sets out the shape of the rollout.
| Period | Employers reaching their staging date |
|---|---|
| October 2012 | Largest employers, 50,000 or more staff [[1]](https://www.gov.uk/government/statistics/ten-years-of-automatic-enrolment-in-workplace-pensions/ten-years-of-automatic-enrolment-in-workplace-pensions-statistics-and-analysis) |
| 2013 to 2015 | Medium-sized employers [[2]](https://commonslibrary.parliament.uk/research-briefings/sn06417/) |
| June 2015 onwards | Small and micro employers [[2]](https://commonslibrary.parliament.uk/research-briefings/sn06417/) |
| February 2018 | Final existing employers staged, rollout complete [[1]](https://www.gov.uk/government/statistics/ten-years-of-automatic-enrolment-in-workplace-pensions/ten-years-of-automatic-enrolment-in-workplace-pensions-statistics-and-analysis) |
The staged approach meant a small business could receive a staging date several years after a large corporate, even though both were covered by the same law. For the smallest employers, many of whom had never run a pension scheme before, the later dates gave time to prepare. The Pensions Regulator, which enforces the duty, supported the rollout with guidance and a compliance regime that escalates from a notice to fixed and daily penalties for employers that fail to act [4].
The end of staging dates
Staging dates only ever applied to employers that already existed when the timetable was running. From 1 October 2017, any newly established employer took on its auto-enrolment duty immediately, from the first day its first member of staff began work, with no staging date at all [2][4]. A business incorporated today therefore has duties the moment it hires, a point that catches out first-time employers who assume there is a grace period. Employers weighing their obligations at the point of a first hire can read the Moonworkers guide to auto-enrolment for the assessment rules that now apply from day one.
How contributions grew to 8%
Auto-enrolment did not start at its current contribution level. The minimum was deliberately set low at launch to ease employers and employees into the habit of saving, then raised in two planned steps known as phasing [5]. The increases were timed to fall on the start of the tax year.
| From | Minimum employer | Minimum total (including employee) |
|---|---|---|
| Launch to 5 April 2018 | 1% | 2% [[5]](https://www.thepensionsregulator.gov.uk/en/business-advisers/automatic-enrolment-guide-for-business-advisers/minimum-contribution-increases-planned-by-law-phasing) |
| 6 April 2018 | 2% | 5% [[5]](https://www.thepensionsregulator.gov.uk/en/business-advisers/automatic-enrolment-guide-for-business-advisers/minimum-contribution-increases-planned-by-law-phasing) |
| 6 April 2019 | 3% | 8% [[5]](https://www.thepensionsregulator.gov.uk/en/business-advisers/automatic-enrolment-guide-for-business-advisers/minimum-contribution-increases-planned-by-law-phasing) |
The 8% minimum that has applied since 6 April 2019 is split into at least 3% from the employer and the balance, ordinarily 5%, from the employee, including the tax relief the pension attracts [6]. These contributions are calculated on qualifying earnings, the band of pay between the Lower Earnings Limit and the Upper Earnings Limit, which for the 2026-27 tax year runs from £6,240 to £50,270 [6]. Payroll teams running this in-house need software that recalculates the qualifying band every pay period, which is why most SMEs handle assessment through dedicated payroll software rather than a spreadsheet.
Who has to be enrolled
The duty has always turned on age and earnings rather than job title. An eligible jobholder, who must be enrolled automatically, is a worker aged between 22 and State Pension age who ordinarily works in the UK and earns above the earnings trigger, set at £10,000 a year for the 2026-27 tax year [6][4]. Workers outside those bounds fall into two other categories, non-eligible jobholders who can choose to opt in and receive employer contributions, and entitled workers who can join a scheme without a mandatory employer contribution [4]. Every worker must be reassessed each pay period, because a pay rise or a birthday can move someone into eligibility.
What auto-enrolment achieved
The measure of the policy is participation, and here the change since 2012 is stark. Workplace pension participation among eligible employees rose from well under half before auto-enrolment to around nine in ten after it, and opt-out rates settled far below the level the government originally modelled, at roughly 8% to 10% of newly enrolled workers rather than the feared quarter or more [1][2]. Enrolling by default, and trusting inertia to keep most workers in, proved to be the decisive design choice.
That success created its own ongoing obligations. Every employer must re-enrol eligible workers who previously opted out roughly every three years, on the third anniversary of their duties start date, and submit a fresh declaration of compliance to the Pensions Regulator to confirm they have done so [4]. The most common compliance failure the regulator sees is an employer treating enrolment as a one-off event and forgetting the triennial cycle. Accountants running this across a client base typically manage the re-enrolment dates and declarations through a payroll bureau platform so no client misses its window.
The duties that arrived with the start date
The 1 October 2012 start date did not simply create a one-off enrolment task. It introduced a set of continuing employer duties that have applied to every business from its own duties start date onwards, and understanding them explains why auto-enrolment is a payroll process rather than a paperwork exercise.
Assessment every pay period
The first duty is to assess each worker every pay reference period, placing them in the eligible, non-eligible or entitled category based on their actual age and actual earnings in that period [4]. This matters most for workers on variable or zero-hours contracts, whose earnings can cross the £10,000 trigger in one month and fall below it the next, moving them in and out of eligibility [6]. Assessment cannot be run once and assumed to hold.
The opt-out window and refunds
A worker who is automatically enrolled has one calendar month to opt out and receive a full refund of any contributions already deducted [4]. The window starts on the later of the date active membership is created or the date the worker receives their statutory enrolment letter, and the employer must refund employee contributions within one month of a valid opt-out notice [4]. An employer must never encourage a worker to opt out, which is a specific offence under the legislation [3].
Postponement, record-keeping and penalties
Employers may postpone assessment for up to three months, for example to cover short-term starters, provided they issue a postponement notice within six weeks [4]. Enrolment and opt-out records must be kept for six years, and other records such as contributions for at least four [4]. Where an employer fails to comply, the Pensions Regulator escalates from a compliance notice to a fixed penalty of £400 and then to daily penalties that rise with workforce size, so the cost of neglecting the duty compounds quickly [4]. For a small business, this web of deadlines is the strongest argument for handling assessment inside payroll software for SMEs rather than by hand.
The reforms still to come
Auto-enrolment is not finished evolving. The Pensions (Extension of Automatic Enrolment) Act 2023 received Royal Assent on 18 September 2023 and gives the Secretary of State the power to make two significant changes: lowering the minimum enrolment age from 22 to 18, and removing the Lower Earnings Limit so that contributions are calculated from the first pound of earnings rather than from £6,240 [7][8].
Neither change is yet in force. The 2023 Act is enabling legislation, meaning it grants the power to make the changes through later regulations rather than making them directly, and the government has not yet set an implementation date [7][8]. When the changes do arrive, they will pull younger and lower-paid workers into pension saving and widen the earnings base on which contributions are calculated, which raises the cost for employers and the stakes for accurate assessment. A payroll engine that already assesses every worker on age and earnings each period, such as the Moonworkers payroll API, can absorb a lower age threshold or a removed earnings limit through a rules update rather than a rebuild.
Check a worker's auto-enrolment status
To see how a given salary is assessed against the current age and earnings rules, an employer can use the Moonworkers auto-enrolment calculator, which applies the 2026-27 thresholds to any pay figure.
Age decides the category: 22 to State Pension age for automatic enrolment, 16 to 74 for opt-in and joining rights. We work out their State Pension age from the statutory timetable.
Assessment result
No assessment yet
Two quick steps: the worker's date of birth, then their pay. The category and minimum contributions appear here.
Auto-enrolment on autopilot
Moonworkers assesses every worker on every payrun, handles enrolment, opt-outs and re-enrolment, and pushes contributions to NEST, Smart Pension and The People's Pension automatically.
Conclusion
Auto-enrolment started on 1 October 2012 as a duty for the largest employers, and within five and a half years it had become an obligation for every business in the country. The two features that defined its first decade, a staged rollout by employer size and a phased climb in contributions to 8%, are now history, replaced by an immediate duty for new employers and a settled minimum that applies to all.
What has not changed is the direction of travel. The system was built to widen over time, and the 2023 Act signals the next expansion towards younger workers and contributions from the first pound. For employers, the practical lesson of the last decade is that auto-enrolment rewards continuous assessment rather than a single enrolment event, and the businesses best placed for the reforms ahead are those whose payroll already tests every worker against the rules on every payrun.
Frequently asked questions
What date did auto-enrolment become law for all employers?
Auto-enrolment began on 1 October 2012 for the largest employers, and the duty was then extended to smaller employers through staging dates until the rollout completed in February 2018 [1]. Since 1 October 2017, any new employer has had an immediate duty from the day it first employs staff, with no staging date [2].
Why did auto-enrolment contributions start so low?
The minimum was set at 2% of qualifying earnings at launch to give employers and employees time to adjust, then raised in two planned steps: to 5% on 6 April 2018 and to 8% on 6 April 2019 [5]. This phasing spread the cost increase over several years rather than imposing the full 8% from day one.
Does my business still have a staging date?
Only employers that existed while the timetable was running had a staging date, and the last of those passed in February 2018 [1]. Any employer set up from 1 October 2017 onwards has no staging date and must comply from the moment its first worker starts [2].
Is the auto-enrolment age going to change from 22?
The Pensions (Extension of Automatic Enrolment) Act 2023 gives the government the power to lower the minimum age from 22 to 18 and to remove the Lower Earnings Limit, but the change is not yet in force and no start date has been set [7]. Until regulations bring those powers into effect, the age remains 22 and contributions are calculated on qualifying earnings from £6,240 [8].
Image prompt for Imagen (also in frontmatter)
Editorial photograph, the back of an accountant standing in front of a wall of labelled ring binders in a small Edinburgh office holding a single open pension file, soft overcast daylight through tall sash windows, late afternoon, palette of slate blue, beige paper, dark wood and granite grey, a granite townhouse exterior glimpsed through the window, asymmetric framing with the figure in the left third, shot on a Sony A7 IV at 35mm f/4, photojournalism, slight film grain, no AI artefacts, no warped hands, no warped text, landscape orientation 16:9.
