{"id":433401,"date":"2026-07-21T16:21:09","date_gmt":"2026-07-21T15:21:09","guid":{"rendered":"https:\/\/seedlegals.com\/?p=433401"},"modified":"2026-07-21T16:21:09","modified_gmt":"2026-07-21T17:21:09","slug":"investing-in-a-uk-startup-what-us-investors-should-know","status":"publish","type":"post","link":"https:\/\/seedlegals.com\/us\/resources\/investing-in-a-uk-startup-what-us-investors-should-know\/","title":{"rendered":"Investing in a UK startup? What US investors should know"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Before investing in a UK startup, learn what PFIC means, why a UK startup may be one, and how to protect yourself from harsher tax treatment.<\/p>\n","protected":false},"author":194,"featured_media":433412,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[147,152],"tags":[],"event_tags":[],"class_list":["post-433401","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-startup-guides-us","category-investor-hub-us"],"acf":{"blog_layout":"v2","v2":{"hero":{"image_background_color":"#E7F1FF","image_fit":"img--contain"},"adverts":[{"type":"selector","selected_advert":{"ID":412056,"post_author":"77","post_date":"2024-11-11 09:42:57","post_date_gmt":"2024-11-11 09:42:57","post_content":"","post_title":"US - Newsletter","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"us-talk-to-the-team","to_ping":"","pinged":"","post_modified":"2024-11-13 16:07:38","post_modified_gmt":"2024-11-13 16:07:38","post_content_filtered":"","post_parent":0,"guid":"https:\/\/seedlegals.com\/?post_type=blog_advert&p=412056","menu_order":0,"post_type":"blog_advert","post_mime_type":"","comment_count":"0","filter":"raw"},"custom_advert":{"advert_tracking_id":"","layout":"default","image":{"image":false,"link":""},"text":{"heading":"","content":"","button":null,"background_color":"#EEF4FF","text_color":"#000646"},"form":{"form":{"type":"none","hubspot_form":{"layout":"newsletter","hide_founderinvestor_toggle":false,"default_community":"founder","custom_form_id":"","gdpr_disclaimer":"By subscribing, you agree to receive information from SeedLegals. You can unsubscribe anytime. View our privacy policy<\/a>"},"custom":{"embed":""},"gtm_form_type":false,"gtm_form_location":false}},"cta_and_testimonials":{"heading":"","button":null,"bullet_points":false,"testimonials":false}}}],"related_sidebar_posts":false},"show_author_card":false,"revision_date":"","hero_image":433412,"has_custom_post_authors":true,"custom_post_authors":{"authors":[{"author":{"ID":169,"user_firstname":"Idin","user_lastname":"Sabahipour","nickname":"Idin Sabahipour","user_nicename":"idin-sabahipour","display_name":"Idin Sabahipour","user_email":"idin@seedlegals.com","user_url":"","user_registered":"2024-08-29 09:55:07","user_description":"","user_avatar":""},"role":"Writer"},{"author":{"ID":3,"user_firstname":"Anthony","user_lastname":"Rose","nickname":"Anthony","user_nicename":"anthony","display_name":"Anthony Rose","user_email":"anthony@seedlegals.com","user_url":"","user_registered":"2019-10-18 15:42:52","user_description":"","user_avatar":""},"role":"Contributor "}]},"is_expert_reviewed":false,"has_sources":false,"post_content_width":"default","post_content":[{"acf_fc_layout":"text","text":"

If you\u2019re a US-based investor looking at a UK startup, you might worry that investing in a foreign company will create extra tax work for you.<\/span><\/p>\n

The good news is that <\/span>investing itself<\/span><\/i> doesn\u2019t usually trigger US tax. But one thing you should understand is a US tax classification called PFIC (which stands for Passive Foreign Investment Company). If the company counts as a PFIC, it can lead to harsher tax treatment when you sell your shares. The good news is that it can usually be avoided with a single step taken early on \u2013 a QEF election \u2013 which we’ll cover later.<\/span><\/p>\n

This guide covers what PFIC is, why a UK startup could count as one, what to ask the company for before you invest, and how a QEF election can protect you.<\/span><\/p>\n

What is a PFIC, and why should you care?<\/b><\/h2>\n

A PFIC is a non-US company that is considered to be \u201cpassive\u201d under US tax rules.<\/span><\/p>\n

There are <\/span>two main ways this is tested<\/span><\/a> (if a company meets either of these tests, it\u2019s a PFIC):<\/span><\/p>\n

    \n
  1. Too much passive income:<\/b> 75% or more of the company\u2019s gross income is \u201cpassive\u201d, from things like interest, dividends, rent or royalties.<\/span><\/li>\n
  2. Too many passive assets:<\/b> 50% or more of the company\u2019s assets are held to produce passive income, from things like cash or investments.<\/span><\/li>\n<\/ol>\n

    The rules were created to stop US taxpayers using foreign companies to defer tax on investment income.<\/span><\/p>\n

    But since the rules are so broad, they don\u2019t just apply to holding companies or investment funds. They can also catch early-stage startups, especially if the company has raised money, is sitting on cash, and hasn\u2019t started generating much operating revenue yet.<\/span><\/p>\n

    That doesn\u2019t automatically make the investment a problem. It just means you need to know whether the company <\/span>is<\/span><\/i> a PFIC or not. This determines what filings or elections you may need to make, and what information the company will need to give you each year.<\/span><\/p>\n

    Why would an ordinary UK startup count as a PFIC?<\/b><\/h2>\n

    At first, PFICs sound like they should only apply to passive investment companies. So you might think a product-building startup is the opposite of that. But the rules <\/span>can<\/span><\/i> still apply to early-stage companies because of two things:<\/span><\/p>\n

      \n
    1. Cash can count as a passive asset \u2013 even cash the company is holding to fund its operations.<\/span><\/li>\n
    2. Interest on that cash can count as passive income.<\/span><\/li>\n<\/ol>\n

      So, imagine a pre-revenue UK startup that has just closed a funding round. It has a big pile of cash on its balance sheet and no operating income yet (maybe just a small amount of bank interest).<\/span><\/p>\n

      On the asset test, the company may look like it mostly holds passive assets. On the income test, its only income may be passive income. On paper, that can make it a PFIC, even though the company is doing exactly what an ambitious startup should be doing (building, hiring and spending the money on growth).<\/span><\/p>\n

      That\u2019s why US investors shouldn\u2019t assume a company is outside the PFIC rules just because it is a regular operating business. The question is how the company looks under the PFIC tests.<\/span><\/p>\n"},{"acf_fc_layout":"content_highlight","highlight_type":"tip","background_colour":"blue","show_icon":false,"content":"\ud83e\udd14 What if US investors own most of the company? The CFC rules explained <\/b>
      \r\n
      \r\nYou might hear the \u201cCFC rules\u201d (Controlled Foreign Corporation) mentioned alongside PFIC. It's a separate US regime, and the key difference is how much control US investors have.
      \r\n
      \r\nPFIC applies to minority US investors, while CFC applies when US shareholders together own more than 50% of a foreign company (by vote or value).
      \r\n
      \r\nFor a typical minority stake in a UK startup, CFC won't apply. It only becomes an issue if US investors end up controlling the company between them \u2013 in which case it's worth getting specific US tax advice.
      \r\n","link":""},{"acf_fc_layout":"text","text":"

      Will investing today cost me any more in US tax?<\/b><\/h2>\n

      No, it won\u2019t. Buying shares isn\u2019t usually a taxable event for US federal income tax purposes. So you don\u2019t owe US tax simply because you wire money and receive stock in a UK company.<\/span><\/p>\n

      But the PFIC consequences <\/span>can<\/span><\/i> arise while you hold the shares. Also, you may have some new reporting obligations as a result (we\u2019ll cover those later).<\/span><\/p>\n

      The company\u2019s PFIC status is also relevant when you eventually sell the shares, because it can affect how any gain is taxed.<\/span><\/p>\n

      That\u2019s why it\u2019s worth checking the company\u2019s PFIC position <\/span>before<\/span><\/i> you invest, rather than waiting until exit.<\/span><\/p>\n

      How PFIC can affect your tax when you sell<\/b><\/h2>\n

      The main issue related to investing in a PFIC isn\u2019t usually the day you invest. It\u2019s what happens later, when you sell your shares at a gain.<\/span><\/p>\n

      That could happen if the company is acquired, you sell your shares in a secondary sale, or if there\u2019s another taxable disposal.<\/span><\/p>\n

      If the company <\/span>was<\/span><\/i> a PFIC (and you didn\u2019t make a valid election), the default PFIC rules can apply. These rules produce a much harsher result than the normal long-term capital gains tax treatment you might expect.<\/span><\/p>\n

      Put simply, here\u2019s how that investment would be treated:<\/span><\/p>\n

        \n
      1. The gain is spread back across every year you hold the stock.<\/span><\/li>\n
      2. The portions allocated to earlier years are taxed at the highest ordinary income rate for each of those years \u2013 up to 37% \u2013 not the roughly 20% long-term capital gains rate you\u2019d normally hope for.<\/span><\/li>\n
      3. An interest charge is added on top, as if you\u2019d owed that tax all along. The longer you hold it, the more it will compound.<\/span><\/li>\n<\/ol>\n

        That combination can make a long-held PFIC investment much more expensive than a normal startup investment. Between the ordinary income rates and the interest charge, a long-held PFIC can hand a large chunk of your gain (maybe even most of it) to the IRS.<\/span><\/p>\n"},{"acf_fc_layout":"content_highlight","highlight_type":"tip","background_colour":"blue","show_icon":false,"content":"\ud83d\udca1 Let\u2019s run through a simple example to see how this works.<\/b>
        \r\n
        \r\nSay you invest in a UK startup, hold the shares for six years, and sell with a $1 million gain.
        \r\n
        \r\nIf the company was not a PFIC that gain may be taxed broadly like a normal long-term capital gain. For a high-income US investor, that could mean up to 20% federal long-term capital gains tax, plus the 3.8% net investment income tax where it applies.
        \r\n
        \r\nSo, very roughly, the federal tax bill might be between $200,000 and $238,000.
        \r\n
        \r\nBut if the company was a PFIC, the default rules can be much harsher. Part of the gain may be taxed at ordinary income rates of up to 37%, and an interest charge is added on top for the years you held the shares.
        \r\n
        \r\nThat means the bill can climb well above $370,000.
        \r\n
        \r\nSo the PFIC status of the company can result in a hugely different tax outcome. The good news is that the harsher default PFIC rules can often be avoided if you make a QEF election (we\u2019re going over that in the next section).
        \r\n","link":null},{"acf_fc_layout":"text","text":"

        What to do if the company <\/b>is<\/i><\/b> a PFIC<\/b><\/h2>\n

        If you hold shares in a PFIC, you may face the harsher default PFIC tax rules when you sell your stock. But the main way to avoid this is <\/span>by making a QEF election<\/span><\/a>, which stands for \u201cQualified Electing Fund\u201d.<\/span><\/p>\n

        A QEF election changes how you deal with the PFIC. Instead of waiting until sale and potentially falling into the default PFIC regime, you include your share of the company\u2019s ordinary earnings and net capital gain on your US tax return each year (even if the company doesn\u2019t distribute the cash).<\/span><\/p>\n

        But in return, when you sell later, you can generally avoid the default PFIC treatment. That means no spreading the gain back across previous years, and no PFIC interest charge.<\/span><\/p>\n

        For an early-stage startup, this can often be a good result. Most startups will have little or no taxable profit in the early years, so there won\u2019t be large amounts for you to report each year. But you still need to make the election properly and keep up with the annual reporting.<\/span><\/p>\n

        That annual reporting is usually done on <\/span>Form 8621<\/span><\/a> (the tax form used for PFIC reporting, including QEF elections). You\u2019ll need to file this with your tax return while you hold PFIC stock.<\/span><\/p>\n

        But when it comes to preparing this form, you\u2019ll need information from the company. In practice, that usually means asking the company to provide a <\/span>PFIC Annual Information Statement<\/b> each year. That\u2019s why, before investing, it\u2019s a good idea to ask the company about their familiarity with PFIC. The issue is usually manageable, but only if the company is able to provide the right information.<\/span><\/p>\n

        There’s also a <\/span>de minimis<\/span><\/i> (or small holdings) exception.\u00a0 It can apply if your total PFIC holdings are worth $25,000 or less \u2013 or $50,000 or less for a couple filing a joint tax return. In that case, you may not need to file Form 8621 that year, as long as you haven’t sold stock or received a distribution.<\/span><\/span><\/p>\n"},{"acf_fc_layout":"content_highlight","highlight_type":"link","background_colour":"blue","show_icon":false,"content":"\ud83e\udd14 Can you benefit from QSBS with these investments? <\/b>
        \r\n
        \r\nYou might be wondering whether your investment can benefit from the Qualified Small Business Stock (or QSBS) exclusion \u2013 the US tax break that can reduce or eliminate federal tax on certain startup exits.
        \r\n
        \r\nFor investment into a UK company, the answer is no. QSBS is designed for stock in a US C-corporation (so a UK-incorporated company doesn\u2019t qualify).
        \r\n
        \r\nWe\u2019ve got more detail in our guides to QSBS for investors and QSBS for founders.
        \r\n","link":""},{"acf_fc_layout":"text","text":"

        Should you worry that your money makes it a PFIC?<\/b><\/span><\/h2>\n

        This shouldn\u2019t worry you. It’s normal for an early-stage company to look<\/span> like a PFIC in the year or two after a raise, while it’s still holding most of the cash from investors like you.<\/span><\/span><\/p>\n

        But as we’ve covered, that PFIC status isn’t a tax bill in itself \u2013 it mostly means you have some annual reporting to do. Also, a QEF election made early means any eventual gain is still taxed as a normal capital gain.\u00a0<\/span><\/p>\n

        So the initial PFIC period isn’t a reason to hold back in making an investment, as long as you elect early and keep up with the reporting.<\/span><\/p>\n

        Checklist: What to look for before you invest<\/b><\/h2>\n

        An investment\u2019s PFIC status is usually manageable if it\u2019s dealt with early. Before you invest in a UK startup, you should ask the company these questions (you \u2013 or your tax advisor \u2013 will need the information):<\/span><\/p>\n