US Personal Tax Services: Sweet Equity for US Managers in UK

An American manager holding sweet equity in a private-equity-backed UK company faces two regimes: HMRC looks at unrestricted market value and a section 431 election signed within 14 days, while the IRS applies IRC section 83 and asks whether an 83(b) election was filed within 30 days. Together they decide what is income and what is gain.

Specialist US Personal Tax Services matter here because the two systems value the same share differently, start the clock at different moments, and produce reportable events in different years. At Jungle Tax we prepare the returns that sit on both sides of that divide, and we are regularly engaged by executives who discover, often at a refinancing or a secondary sale, that the US half of their management equity was never reported. This guide covers the acquisition and holding stages only: what should have been filed, how value is established, how basis is carried through ratchets and leaver events, and how unreported years are brought back into order.

What is sweet equity, and why does it create a US tax problem?

In a typical UK buyout, the institutional investor funds the acquisition vehicle mostly through shareholder loan notes and preference shares carrying a fixed coupon, often compounding annually. Only a thin slice of the capital sits in ordinary shares. Management subscribes for a meaningful share of those ordinary shares, sometimes a fifth or more of the equity, for a modest cash sum. Because the ordinary shares only participate once the loan notes and preference shares have been repaid with their accrued return, their value at completion is low. If the business performs, the ordinary shares capture most of the upside. That leverage is the "sweetness".

For a UK-resident British executive, the tax analysis is familiar ground under Part 7 of the Income Tax (Earnings and Pensions) Act 2003. For an American executive, it is only half the analysis. A US citizen or green card holder is taxed on worldwide income wherever they live, so the same shares are also "property transferred in connection with the performance of services" under IRC section 83. The US rules were not written with UK buyout documentation in mind, and the result is a set of traps that generalist preparers on either side routinely miss.

The typical instrument stack

• Loan notes: held by the investor, sometimes with a small management strip, carrying a fixed rolled-up coupon.
• Preference shares: a fixed preferred return, ranking ahead of ordinary equity.
• Institutional ordinary shares: the investor's share of the ordinary equity.
• Management ordinary shares (sweet equity): subscribed by managers, frequently a separate class, subject to leaver provisions, drag and tag rights, transfer restrictions and, in some deals, a ratchet.

How does HMRC tax sweet equity at acquisition?

The UK starting point is that shares acquired by reason of employment are employment-related securities. If the manager pays less than the shares' market value, the shortfall is employment income. The question is which market value.

Unrestricted market value and actual market value

Sweet equity almost always counts as "restricted securities" because of its leaver provisions: a bad leaver typically must sell at the lower of cost and market value. Under Chapter 2 of Part 7, the restricted value (actual market value, taking the restrictions into account) is lower than the unrestricted market value (UMV), which is the value the shares would have if the restrictions did not exist. Without an election, the gap between the two is not taxed at acquisition. Instead, a proportion of the eventual growth is taxed as employment income when the restrictions lift or the shares are sold, potentially with PAYE and National Insurance if the shares are readily convertible assets.

The section 431 election

The standard protection is a joint election between employer and employee under section 431 ITEPA 2003, made within 14 days of acquisition. HMRC's manual on elections to exclude outstanding restrictions explains that the election treats the shares as though the restrictions did not exist. The manager is taxed at acquisition on any excess of UMV over the price paid, and in exchange later growth falls outside Chapter 2 and is generally within capital gains tax.

In most buyouts, managers pay a price agreed to equal UMV, so a section 431 election gives rise to no immediate charge. The election is not sent to HMRC; the employer keeps it, and its existence is confirmed on the company's employment-related securities return. Where no election was signed, or it was signed on day 15, the UK position on exit is materially worse, and that is a fact the US preparer needs to know too, because it changes the character and year of UK tax available for credit.

The 2003 memorandum of understanding

Much UK market practice rests on a memorandum of understanding agreed in 2003 between HMRC and the British Private Equity and Venture Capital Association. Broadly, where managers pay at least the same price per share as the investor pays for its ordinary shares, the investor's return comes mainly through loan notes and preference shares at commercial rates, and the managers are full-risk investors, HMRC will generally not seek to argue that the sweet equity was acquired at an undervalue. Not every deal fits within it, and it is a UK valuation comfort only. It has no standing with the IRS.

The employment-related securities annual return

The company, not the manager, must report the acquisition on its ERS annual return by 6 July after the end of the UK tax year. Leaver buybacks, ratchet adjustments and later share movements are reportable events too. We set out the scheme registration, deadlines and escalating penalties in detail in our guide to the employment-related securities annual return, together with HMRC's own guidance on telling HMRC about employment related securities. For the American executive, the ERS return is valuable evidence: it records the acquisition date, the price paid, the market value used and whether a section 431 election exists, which is precisely the documentation a US reconstruction needs.

How does IRC section 83 apply to sweet equity?

Section 83 taxes property received in connection with services when it becomes "substantially vested", meaning it is either transferable or no longer subject to a substantial risk of forfeiture. On vesting, the excess of fair market value over the amount paid is ordinary compensation income.

Paying full value does not take you outside section 83

This is the point most often missed. Many managers assume that because they paid market value, there is nothing for the IRS to tax. The US courts disagree. In Alves v. Commissioner, the Ninth Circuit held that section 83 applied to restricted stock acquired in connection with employment even though the employee paid full fair market value. The consequence is striking: if the shares are subject to a substantial risk of forfeiture and no 83(b) election is made, all of the growth up to the vesting date becomes ordinary income in the year of vesting, even though the executive paid full price on day one.

Is a bad leaver clause a substantial risk of forfeiture?

Generally, yes, to the extent it bites on value. A provision that forces a manager who leaves within a set period to sell at the lower of cost and market value conditions the appreciation on continued service. Time-based good leaver schedules, where the proportion sold at full value increases year by year, are classic vesting provisions. By contrast, a requirement to sell at full fair market value on any departure is not a forfeiture condition. Sweet equity documents frequently mix the two, and the answer can differ by tranche.

The 83(b) election

An 83(b) election lets the executive include income at the time of transfer, measured as fair market value at that date less the price paid. Where the price equals value, the income is nil. Later growth then becomes capital gain, the holding period starts at acquisition, and no further income arises at vesting. The election must reach the IRS within 30 days of the transfer. There is no extension and no general late-election relief. Since 2016, a copy no longer has to be attached to the annual return, and the IRS has since released Form 15620 as an optional standard format for making the election, though a compliant signed statement remains valid.

Because the 30-day window is shorter than most US managers realise, and because UK deal counsel focus on the 14-day section 431 election rather than the US equivalent, we frequently find that the section 431 election was signed and the 83(b) election was never made. That combination is the most common source of a mismatch between the two returns.

US vs UK treatment of sweet equity at a glance

Issue	UK (HMRC, ITEPA 2003 Part 7)	US (IRS, IRC section 83)
Protective election	Section 431, joint employer and employee election	Section 83(b), made by the employee alone
Deadline	14 days from acquisition	30 days from transfer, no extension
Filed with the tax authority?	No; kept by employer, confirmed on ERS return	Yes; sent to the IRS
Valuation standard	Unrestricted market value, ignoring all restrictions	Fair market value ignoring lapse restrictions, but taking permanent (non-lapse) restrictions into account
Consequence of no election	Part of growth taxed as employment income when restrictions lift or on sale	All growth to vesting taxed as ordinary income in the vesting year
Loss if shares forfeited after election	Capital loss by reference to amount paid and any amount taxed	Capital loss limited to amount paid less amount received; no deduction for income previously included
Annual reporting while holding	Company files ERS annual return	Form 8938 (if thresholds met); Form 5471 or 8621 in specific cases

How is the value of sweet equity established for both returns?

Valuation is where a well-documented UK position can still leave a US gap. HMRC's UMV ignores every restriction. The US standard under the section 83 regulations ignores lapse restrictions, such as time-limited leaver terms, but takes account of a non-lapse restriction, one that will never expire, such as a permanent formula price. In practice most sweet equity restrictions lapse, so the two figures are usually close, but they are not identical by definition, and the US file should record why the figure adopted is appropriate.

The acquisition value is normally supported by a valuation prepared for the deal. For low-value ordinary shares behind a heavy preferred stack, valuers typically use an option-pricing or waterfall approach: the ordinary equity is modelled as a call option over enterprise value above the loan notes and preference shares, including accrued coupon. The same report can usually support both returns if it is reconciled to both standards. Where no report exists, which is common in unreported US years, we rebuild value from the completion funds flow, the capitalisation table, the investor's price per ordinary share and the terms of the MoU pricing, and we document the basis so that it can withstand review.

Partly paid shares and management loans

Where managers fund the subscription with a loan from the company or subscribe for partly paid shares, both systems react. In the UK, Chapter 3C of Part 7 can treat the unpaid amount as a notional loan. In the US, a nonrecourse loan used to acquire the shares may cause the arrangement to be treated as an option rather than a transfer of property, which can mean that an 83(b) election made at subscription was ineffective. These structures need reading at the level of the documents, not the term sheet.

How do you track basis through ratchets and leaver provisions?

US basis in sweet equity is the amount paid plus any amount included in income under section 83. The holding period begins at transfer if an 83(b) election was made, or at vesting if not. Getting this right in the holding years is what makes the eventual exit reportable without a scramble.

Ratchets

A ratchet adjusts management's share of equity by reference to the investor's return, either by converting or cancelling shares or by issuing new ones. For UK purposes, a ratchet may engage the post-acquisition rules and should be reviewed against the MoU framework and reported on the ERS return when it operates. For US purposes, the question is whether the ratchet was an attribute of the shares from the outset or a new transfer of property in connection with services. If it is a new transfer, a fresh section 83 analysis, and potentially a fresh 83(b) decision within 30 days, arises. We maintain a lot-by-lot schedule so that original shares, ratchet shares and any re-designated shares carry their own basis and holding period.

Leaver events

If a manager leaves as a bad leaver after making an 83(b) election, the shares are bought back at the lower of cost and value. For US purposes, the loss is limited to the amount paid less the amount received, and income previously included under the 83(b) election is not deductible. For a good leaver, the buyback is simply a disposal. On the UK side, the buyback is an ERS reportable event, and where a section 431 election was made the disposal is generally within capital gains tax.

Other holding-period filings

• Form 8938: directly held shares in a foreign company are specified foreign financial assets. For a US person living abroad, reporting generally applies where such assets exceed $200,000 at year end or $300,000 at any time (single), or $400,000 and $600,000 for married filing jointly. The IRS page on Form 8938 sets out the thresholds. Sweet equity may be low value at first and cross the threshold later.
• Form 5471: required where the executive holds 10% or more of the vote or value of the foreign company, including through attribution. Senior managers of smaller buyouts can reach this, especially after a ratchet.
• PFIC testing: a holding company whose subsidiaries run an active trade will usually pass the look-through tests, but a Jersey or Guernsey topco or an unusual structure should be tested and the conclusion recorded, because Form 8621 failures keep the statute open.
• FBAR: directly held shares are not a financial account, but any custody or nominee account holding them, and the dividend or sale proceeds account, may be.

What happens on both returns when sweet equity is eventually sold?

We cover share-for-share exchanges and rollovers elsewhere. For a straightforward cash disposal, the reporting outcome depends on the elections made at the start.

• Section 431 and 83(b) both made: the growth is capital gain in both countries. UK capital gains tax rates of 18% and 24% apply for disposals from 30 October 2024, and the US applies long-term capital gains rates, plus potentially the 3.8% net investment income tax, which UK tax generally cannot credit. For a US citizen resident in the UK, the treaty resourcing rules generally allow UK tax on the gain to be credited against US tax on the same gain, reported through Form 1116.
• Section 431 made, 83(b) not made: the UK treats the growth as capital. The US may already have taxed growth up to vesting as ordinary compensation income in an earlier year, when there was no UK tax at all to credit. On sale, only growth after vesting is US capital gain. This is the mismatch that most often causes double tax.
• Neither election made: part of the growth may be UK employment income, and all pre-vesting growth is US compensation income. Compensation income sourced to UK services is generally foreign-source earned income, which may be eligible for the foreign earned income exclusion or foreign tax credit in the year the UK taxes it, but the years rarely line up.

How do you fix years in which sweet equity was never reported?

Unreported sweet equity is a timing problem as much as a disclosure problem. The vesting income, if any, belonged to a specific year, and the Form 8938 and Form 5471 obligations belonged to every year the shares were held. A clean remediation follows a set sequence.

1. Assemble the deal record: subscription agreement, articles, investment agreement, leaver and ratchet terms, section 431 election, any 83(b) election and proof of mailing, valuation report and the company's ERS returns.
2. Determine the US events: whether each tranche was subject to a substantial risk of forfeiture, whether an 83(b) was validly made, and the vesting date of each tranche if not.
3. Value each event: fair market value at acquisition and, where needed, at each vesting date, supported by a reconstructed valuation.
4. Quantify the tax: compensation income by year, foreign earned income exclusion or foreign tax credit availability, and information return exposure.
5. Choose the route: where the failure was non-wilful and the executive lives outside the US, the Streamlined Foreign Offshore Procedures allow three years of amended or original returns and six years of FBARs with no penalty. Our streamlined filing team prepares these submissions. Where only information returns are missing and the income was fully reported, delinquent information return procedures may be more appropriate.
6. Align the UK side: confirm the company's ERS returns reflect the acquisition and any events, and that the executive's UK self assessment returns are consistent with the US reconstruction.

A missed 83(b) election cannot be made late. Remediation is about reporting the consequences correctly, not undoing them. That is why the analysis must be done before anyone signs an amended return: in some cases the vesting income fell in a year that is now closed, or the income qualifies for the exclusion, and the exposure is smaller than feared. In others, the information return penalties matter more than the tax.

Why a cross-border preparer, not two separate ones?

The UK adviser on the deal will have focused on UMV, the section 431 election and the MoU. A US preparer with no UK buyout experience may not recognise that a lower-of-cost-and-value leaver clause is a forfeiture condition, or that a ratchet was a new transfer. The value of a single US-UK tax accountant is that both returns are prepared from the same schedule of lots, values and dates, and the foreign tax credit position is built with both returns in view. Our US tax services and UK tax services teams work from one file for exactly this reason. We prepare and report; we do not structure management equity or advise on deal terms.

If you hold sweet equity in a UK buyout and are not certain an 83(b) election was made, or your US returns have never reflected your management shares, the earlier the position is reviewed, the more options remain open. Speak in confidence with our specialists and contact our cross-border team to arrange a private consultation on your returns.