Claiming income/deductions on an illegal apartment
The IRS demands and expects to be paid tax on all taxable activity, including illegal activity.  If they expect drug dealers, hit men, and smugglers to pay tax, they expect you to pay tax on your basement apartment. The flip side of this is that the IRS keeps reported tax activities confidential.  They only share what is required (for example, your taxable income with your state).  You can read the details in their disclosure laws.   Deductions will work just as they would if your apartment was perfectly legal.  In the eyes of the IRS, whether your income is legal or not is none of their business.  They care only about whether it is being taxed appropriately. They will not share any information with your zoning authority without a court order. A basement unit would typically rent for less than similar space on a higher floor.  Taxwise, you should be claiming the income, and expenses via schedule E, as if it were legal. Keep in mind, Al Capone was convicted on tax evasion  not his other illegal activities. As long as you treat it as a legitimate business, a rental unit, you will be good with the IRS. The local building department will fine you if they find out.
"The founders almost certainly owe tax on the ""income"" represented by the rent they aren't being charged. It isn't clear whether the corporation also owes income tax on the rent it is not receiving back from them. You definitely want advice from a paid tax accountant, not least because that helps protect everyone should this arrangement be challenged." "It says that you are exempt ""as long as such interest income is not effectively connected with a United States trade or business"". So the interest is from money earned from doing business with/through AirBnb, a US company. So you will have to report it. Even if your bank doesn't send you a 1099-INT, you have to report it, unless it is under $0.49 because the IRS allows rounding." If you want to be safe, only claim deductions for which you have a receipt. This explanation may help. "A real estate business could offset income from occupied property with costs from vacant property held for speculation.  For speculation, you can let a building rot, then get it reassessed.  If the jurisdiction assesses part or all of the tax bill on the value of improvements, this can drop the annual tax bill significantly while you hold.  If you plan to hold for a decade or more, this can be very important.  Strategically, this also ruins the neighborhood property values, so you can assemble neighboring parcels to support future major developments.   This is a long speculation game.  Exemplars of the strategy include Richard Basciano who bought up several buildings in NYC's Times Square and installed adult theater tenants in the 70s, for payoff today; and the late Sam Rappaport who pursued a strategy of squeezing rent and simply ignoring building inspection violations in Philadelphia, assembling major urban core parcels on the cheap, and whose children are now selling into strong markets.   Legality: Adult businesses are kind of a grey market covered by specific local ordinances, neither exactly illegal or perfectly legal.  Ignoring building violations is not legal, but the penalties are fines, not jail.  It's certainly not a ""nice"" strategy.   Richard Basciano: http://www.nydailynews.com/new-york/porn-king-richard-basciano-survived-rudy-giuliani-plans-risk-article-1.319185 Sam Rappaport: http://www.bizjournals.com/philadelphia/stories/2002/08/05/focus13.html?page=all" Be ruthlessly meticulous about the IRS regulations for deducting a home office.  If it's allowed, it's allowed. You only need to report INCOME to the IRS. Money which you are paying to a landlord on behalf of someone else is not income. The IRS' primary reference Pub 519 Tax Guide for Aliens -- current year online (current and previous years downloadable in PDF from the Forms&Pubs section of the website) says NO: Students and business apprentices from India.   A special rule applies .... You can claim the standard deduction .... Use Worksheet 5-1 to figure your standard deduction. If you are married and your spouse files a return and itemizes deductions, you cannot take the standard deduction. Note the last sentence, which is clearly an exception to the 'India rule', which is already an exception to the general rule that nonresident filers never get the standard deduction. Of course this is the IRS' interpretation of the law (which is defined to include ratified treaties); if you think they are wrong, you could claim the deduction anyway and when they assess the additional tax (and demand payment) take it to US Tax Court -- but I suspect the legal fees will cost you more than the marginal tax on $6300, even under Tax Court's simplified procedures for small cases. If you earn money while in the US or from renting your US house - you have to pay taxes to the US on that income. If you become US tax resident - you have to pay US taxes on your worldwide income. Whether or not you're in the US illegally or receiving income while breaking any other law - doesn't matter at all. Maybe you should consider setting up a Taxpayer Identification Number (TIN) for your business dealings as a landlord and consider providing that instead of your SSN for this type of thing. I am assuming (if this is legitimate) they want it so they can send you a 1099 as they might be obligated to do if they are claiming the rent as a business expense. Also, I'd suggest having the tenant tell their employer to contact you directly. There is no need for the tenant in this situation to also get your SSN/TIN. "The rent payment is in principle taxable. However, you should be able to take advantage of the ""rent a room"" scheme, and the proposed rent falls well under the £7,500/year tax threshold for that. So no tax will be actually payable and you don't have to formally declare it as long as you stay below that threshold. You should also be fairly well legally protected in case you do split up in future and you want to remove her. As you would be living there too, she would just be a lodger, not a tenant (technically, an ""excluded occupier""). If you did want her to leave you would only need to give reasonable notice and wouldn't need a formal court order if you needed to force her to go. As JBentley points out, there have been court cases where domestic partners contributing to household expenses while the other partner paid the mortgage have later been able to claim that this implied joint ownership. This was on the basis of a ""constructive trust"" being implicitly setup by the way they arranged their finances. In your case, if there's a clear intention, formalised in writing, for the money to be treated as rent rather than a contribution towards purchasing the property, I think it should make it very hard to claim the contrary later. I would also suggest you be clear about whether the rent includes a share of the utility bills, and that things like groceries would be handled separately and split 50:50 or whatever. As pointed out in a comment, there are template agreements for lodgers you could use a starting point (e.g. this one), but it's likely you'd need to customise it to your circumstances. Another point made in another answer is that there's potential upcoming legislation to give some rights to cohabiting partners. In the current draft, those would kick in after three years or having children. If the bill does come into effect, you'd also be able to sign an opt out, but only after getting legal advice, and it would still be possible (though presumably hard) to persuade a court to overturn an opt out. Overall that does create a small risk to you, but not one that comes directly from your girlfriend paying rent. It's likely that if you are both on an equal financial footing and had always kept your finances separate, that there wouldn't be any award made anyway. And you can't run your entire life on hypothetical risks." In Canada I think you'd do it as a % of square footage. For example: Then you can count 20% of the cost of the of renting the apartment as a business expense. I expect that conventions (i.e. that what's accepted rather than challenged by the tax authorities) may vary from country to country. It's very possible that someone would lie to their landlord/landlady, but not be prepared to lie to the police.  So here's what I would do. Advise your tenant that since her money has been stolen from your letterbox, she should report the theft to the police. If she refuses to report the theft to the police, then her story is probably a lie.  In which case, treat the rent as deliquent and demand payment in full.  Invoke whatever kind of recourse is available in your jurisdiction. If she goes ahead and reports the theft, then it's very likely that her story is true.  It's probably in your interest to stay on good terms with such a tenant, so you could offer to split the loss with her.  But let her know that this is a one-time offer, and you won't be so generous again. From a tax perspective, it doesn't matter whether what you are doing is fraud, illegal, or perfectly legit.  If you make money, the IRS will want you to pay taxes on it.  Drug dealers, pimps, hobos, professional gamblers, extortionists, coupon collectors.  The IRS doesn't care.  They want their taxes. Now, where do you pay taxes?  There are two likely options:  I'm not a tax lawyer so I can't say which would be more correct.  My expectation is that the IRS would be fine with either. It is ordinary income to you. You should probably talk to a California licensed CRTP/EA/CPA, but I doubt they'll say anything different. You would probably ask them whether you can treat some of it as a refund of rent paid, but I personally wouldn't feel comfortable with that. First, what Daniel Carson said. Second, if you're getting started, just make sure you are well diversified.  Lots of growth stocks turn into dividend stocks over time-- Microsoft and Apple are the classic examples in this era.  Someday, Google will pay a dividend too. If you're investing for the long haul, diversify and watch your taxes, and you'll make out better than nearly everyone else.