The 31 January deadline is a uniquely British kind of dread. A cold, grey morning, a strong tea, and the creeping realisation that you have absolutely no idea where you put your receipts from last April. Now imagine that same panic, but your receipts include “repulsors, Mark 47 suit (business use only)”, “return portal from the Mirror Dimension” and “one jar of Pym Particles (miscellaneous)”. Welcome to the most chaotic corner of the HMRC online portal you have never thought about before. The Marvel characters self-assessment tax return situation is frankly a nightmare, and we are here for every excruciating detail.
Tony Stark: Sole Trader, Reluctant Taxpayer, Definitely Under Investigation
Let us start with the big one. Tony Stark is, at his core, a freelance defence contractor who pivoted into saving the world without ever properly updating his Companies House registration. In the UK, he would be operating as a sole trader under “Stark Industries (UK Branch)” and almost certainly filing his return at approximately 11:58pm on 31 January with a glass of Scotch in hand.
His income sources alone would make an HMRC inspector weep. There is the licensing revenue from his patents. There is the fee he probably charges the government for each Avengers mission (he absolutely does). There is also the small matter of the Iron Man suits, which he would attempt to claim as a capital allowance under plant and machinery. The suits cost billions. HMRC would have a view on that.
His expenses would be equally spectacular. Business mileage at 45p per mile for the first 10,000 miles, except his commute is sometimes “low Earth orbit”, which is not a recognised postcode district. He would also try to claim his Malibu cliff house as a home office, forgetting that he destroyed it in Iron Man 3 and it is therefore probably not eligible for property relief. Pepper Potts would be furious. JARVIS would have filed it correctly by March.
Doctor Strange: The Self-Employed Property Nightmare
Stephen Strange is a man with multiple properties across dimensions, a Grade II listed townhouse in Mayfair (the Sanctum Sanctorum sits in the New York version, but let us say the London branch exists on Belgrave Square for tax purposes), and a complicated income stream that blends “former neurosurgeon” with “Sorcerer Supreme”.
The property question alone is catastrophic. Strange owns, or at least occupies, buildings across multiple planes of existence. Does the Mirror Dimension count as overseas property? Technically it has no sovereign territory, which means it is either exempt from UK tax rules or constitutes an entirely novel category that the HMRC guidance at gov.uk/self-assessment-tax-returns has not yet accounted for. Either way, Strange would be leaving it blank and hoping nobody notices.
His income as Sorcerer Supreme is harder to categorise. Is he employed by the Masters of the Mystic Arts? Self-employed? A charity? He has no employment contract, no P60, and his clients largely pay in “eternal gratitude” and “the universe not being destroyed”. HMRC accepts neither as a valid payment method.
Black Widow: Freelance Operative With a Very Tricky Employment History
Natasha Romanoff has the most complex employment history of anyone who has ever attempted a Marvel characters self-assessment tax return. Former KGB asset, SHIELD operative, Avenger, then briefly a fugitive. That is no fewer than four different employment statuses in one career, and at least two of them are organisations that do not technically exist on any official register.
For UK tax purposes, the question of whether SHIELD counts as a foreign employer is genuinely thorny. It was a UN-adjacent body (probably), which might mean her income was exempt under diplomatic protocols, except SHIELD collapsed in Captain America: The Winter Soldier and presumably stopped issuing payslips around the same time. If she never received a P45, she may still technically be considered employed by an organisation that no longer exists. HMRC would refer this to the Counter Avoidance Directorate immediately.
Her expenses, meanwhile, are a delight. Widow’s Bites (combat gadgets, business use): possibly claimable as tools of the trade. Black leather tactical suit: HMRC guidance says clothing is only deductible if it cannot be worn outside work. The suit is not exactly M&S, but it is technically wearable. She would try. They would decline it. She would accept that outcome with unsettling calm.
Does Asgard Count as an Overseas Territory for Tax Purposes?
Thor raises the single most entertaining jurisdictional question in the entire Marvel universe. He is a Norwegian god (the myths are Norse, so technically Scandinavia has a prior claim) who is also a prince of a realm in a different galaxy, currently residing on what remains of a floating city that relocated to Tønsberg and then presumably qualified for some kind of Norwegian coastal development grant.
For a UK resident, income from overseas property and overseas employment is generally still taxable, depending on domicile status. Thor, as a non-UK domicile who has been resident here for several tax years through Avengers activity, would likely fall under the arising basis by now. That means his income from Asgard, his stipend as heir to the throne, and any revenue from the Bifrost (toll bridge? Private infrastructure? Hard to say) would all need declaring.
His accountant, if he had one, would be billing 400 hours minimum and weeping into their spreadsheets. If you think sorting out Thor’s dimensional tax affairs sounds expensive, you should know that even building a basic web presence does not have to be. There are Free Websites out there for small businesses, which is more than any Asgardian treasury ever offered.
The Expenses Marvel Heroes Would Definitely Try to Claim
Just for the record, here is a partial list of deductions that various Avengers would attempt, ranked by audacity:
- Captain America: Uniform cleaning (reasonable), shield replacement (capital allowance, maybe), 70-year pension shortfall from being frozen in ice (not a thing HMRC recognises, but full marks for trying).
- Ant-Man: Travel expenses at microscopic scale. He would argue that shrinking means he technically used less fuel per mile and should receive a proportionally larger claim. HMRC would have no precedent for this.
- Spider-Man: Web fluid as consumables (plausible), Spider-Man suit made by himself (potentially claimable under homeworker costs), tutoring income from being a sixth-form student on the side (taxable above the £1,000 trading allowance, probably).
- The Hulk / Bruce Banner: Two separate self-assessments? One per personality? Split income claims? The legal complexity would genuinely break the system.
What HMRC Would Actually Do About All This
Realistically, the Counter Avoidance team would open an enquiry within fifteen minutes of Tony Stark’s submission. Strange would receive a compliance letter asking him to clarify the nature of his “dimensional consultancy” work. Thor’s return would be flagged for specialist overseas review and then quietly set aside because nobody knows what legislation applies to a Norse god’s inheritance.
Black Widow’s return would simply vanish from the system under circumstances that remain unexplained.
The broader point, absurd as all of this is, is that the UK self-assessment system is brilliantly, chaotically unequipped for anyone whose income does not fit neatly into a payslip. As the ONS notes, over 12 million people filed a self-assessment return in the 2024-25 tax year, and a significant chunk of them found the process baffling without any interdimensional complications involved. If even regular freelancers struggle, spare a thought for a billionaire with repulsor boots and no time to organise his receipts.
The Marvel characters self-assessment tax return remains one of the great untold stories of the MCU. Not because it lacks drama. Precisely because it has far too much of it.
Frequently Asked Questions
What is a self-assessment tax return in the UK?
A self-assessment return is how self-employed people, freelancers and anyone with untaxed income report their earnings to HMRC each year. The deadline for online returns is 31 January following the end of the tax year. You can find full guidance at gov.uk/self-assessment-tax-returns.
Would Tony Stark actually need to file a UK self-assessment?
If he were UK-resident and earning self-employed or investment income above the relevant thresholds, yes absolutely. As a billionaire tech entrepreneur with patent royalties and government contracts, he would have several income streams requiring declaration.
Can you claim superhero costumes as a work expense?
HMRC only allows clothing deductions if the item is a uniform or protective wear that cannot reasonably be worn outside of work. A skin-tight red and gold suit or a black tactical bodysuit would face scrutiny, though a case could be made for protective functionality.
Does income from overseas or other dimensions need declaring in the UK?
UK residents are generally taxed on worldwide income unless they qualify for non-domicile status. Income from overseas property, foreign employment or interdimensional toll bridges would likely need declaring, though HMRC guidance has not yet covered the Bifrost specifically.
What happens if you miss the HMRC self-assessment deadline?
Missing the 31 January deadline results in an automatic £100 penalty, with further charges building up after three and six months. Interest also accrues on any unpaid tax. Even a Sorcerer Supreme would not be immune to late filing penalties.