Tax implications of having some self-employment income?
"You would put your earnings (and expenses, don't forget) on Schedule C, and then do a Schedule SE for self-employment tax. http://www.irs.gov/businesses/small/article/0,,id=98846,00.html 1040ES isn't used to compute taxes, it's used to pay taxes. Generally you are supposed to pay taxes as you go, rather than when you file. There are exceptions where you won't be penalized for paying when you file, ""most taxpayers will avoid this penalty if they owe less than $1,000 in tax after subtracting their withholdings and credits, or if they paid at least 90% of the tax for the current year, or 100% of the tax shown on the return for the prior year, whichever is smaller"" from http://www.irs.gov/taxtopics/tc306.html  i.e. there's a safe harbor as long as you pay as much as you owed the year before. If you owe a lot at the end of the year a second time in a row, then you get penalized." Havoc P's answer is good (+1). Also don't forget the other aspects of business income: state filing fees, county/city filing fees, business licenses, etc.  Are there any taxes you have to collect from your customers? If you expect to make more this year, then you should make estimated quarterly tax payments.  The first one for 2011 is due around the same time as your federal income tax filing.
Your taxable income is your total income from however many sources of income you have. If you are in employment and doing self-employed job at the same time, your taxable income will be a combination of both incomes.  For example if in employment you make £10000 and self employed you make another £10000 - your total income is £20000 and this is your taxable income.  And even if your self-employed job does not bring you more than personal allowance, how would HMRC know that without you filling-in tax return? "I did a little research and found this article from 2006 by a Villanova law professor, titled ""No Thanks, Uncle Sam, You Can Keep Your Tax Break"".  The final paragraph of the article says: Under these circumstances, it is reasonable to conclude that a taxpayer is not required to claim a allowable deduction unless a statutory provision so requires, or a binding judicial precedent so specifies. It would be unwise, of course, to forego a deduction that the IRS considers mandatory such as those claimed by self-employed individuals with respect to their self-employment,    whether for purposes of the self-employment tax or the earned income tax credit. Until the statute is changed or some other binding authority is issued, there is no reason taxpayers who wish to forego deductions, such as the dependency exemption deduction, should hesitate in doing so. (The self-employment tax issues in the quote cited by CQM are explicitly discussed in the article as one of a few special kinds of deduction which are mandatory.) This is not a binding statement: it's not law or even official IRS policy.  You could never use it as a defense in the event that this professor turned out to be wrong and the IRS decided to go after you anyway.  However, it is a clear statement from a credible, qualified source." "This seems to depend on what kind of corporation you have set up. If you're set up as a sole proprietor, then the Solo 401k contributions, whether employee or employer, will be deducted from your gross income.  Thus they don't reduce it. If you're set up as an S-Corp, then the employer contributions, similar to large employer contributions, will be deducted from wages, and won't show up in Box 1 on your W-2, so they would reduce your gross income.  (Note, employee contributions also would go away from Box 1, but would still be in Box 3 and 5 for FICA/payroll tax purposes). This is nicely discussed in detail here. The IRS page that discusses this in more (harder to understand) detail is here. Separately, I think a discussion of ""Gross Income"" is merited, as it has a special definition for sole proprietorships. The IRS defines it in publication 501 as: Gross income.    Gross income is all income you receive in the form of money, goods, property, and services that is not exempt from tax. If you are married and live with your spouse in a community property state, half of any income defined by state law as community income may be considered yours. For a list of community property states, see Community property states under Married Filing Separately, later. Self-employed persons.    If you are self-employed in a business that provides services (where products are not a factor), your gross income from that business is the gross receipts. If you are self-employed in a business involving manufacturing, merchandising, or mining, your gross income from that business is the total sales minus the cost of goods sold. In either case, you must add any income from investments and from incidental or outside operations or sources. So I think that regardless of 401(k) contributions, your gross income is your gross receipts (if you're a contractor, it's probably the total listed on your 1099(s))." You need to register as self-employed with HMRC (it is perfectly fine to be self-employed and employed by an employer at the same time, in exactly your kind of situation). Then, when the income arrives you will need to declare it on your yearly tax return.  HMRC information about registering for self-employment and declaring the income is here: https://www.gov.uk/working-for-yourself/overview There's a few extra hoops if your clients are outside the UK; the detail depends on whether they are in the EU or not. More details about this are here: https://www.gov.uk/online-and-distance-selling-for-businesses/selling-overseas . In some circumstances losses from self-employment can be offset against total income and/or capital gains. If this applies to you may be able to claim back some of the tax taken by PAYE from your day job.  You can also to some extent carry the loss backwards into previous tax years or forward into the next one if you can't use it fully this year. HMRC have some information available on the current rules: When you can claim losses  You can claim: But You can’t claim: I agree with your strategy of using a conservative estimate to overpay taxes and get a refund next year. As a self-employed individual you are responsible for paying self-employment tax (which means paying Social Security and Medicare tax for yourself as both: employee and an employer.) Current Social Security Rate is 6.2% and Medicare is 1.45%, so your Self-employment tax is 15.3% (7.65%X2) Assuming you are single, your effective tax rate will be over 10% (portion of your income under $ 9,075), but less than 15% ($9,075-$36,900), so to adopt a conservative approach, let's use the 15% number.  Given Self-employment and Federal Income tax rate estimates, very conservative approach, your estimated tax can be 30% (Self-employment tax plus income tax) Should you expect much higher compensation, you might move to the 25% tax bracket and adjust this amount to 40%. No, it's not possible. Even if you had no deduction or credits, your federal tax on $16,604 would be: $9075 @ 10% = $907.50 +  $7529 @ 15% = $1129.35 = $2036.85 That assumes you are filing as single. There must be more to the story.  Typo in your income numbers?  Also, what do you mean by a self-employment tax deduction? Maybe update your question to include a breakdown of everything you entered? Edit: As noted in Loren's answer, it seems that it is indeed possible in at least one case (self-employment taxes). Generally, unless you explicitly elect otherwise, LLCs are transparent when it comes to taxes. So the money in the LLC is your money for tax purposes, there's no need to pay yourself a salary. In fact, the concept of salary for LLC members doesn't exist at all. It is either distributions or guaranteed payments (and even that is mostly relevant to multi-member LLCs). The only concern is the separation of personal and LLC finances - avoiding commingling. Mixing your personal and business expenses by using the same accounts/cards for both business and personal spending may cause troubles when it comes to the liability protection in case of a lawsuit. I'd suggest discussing this with a FL-licensed attorney. Bottom line - technically the withdrawal is just writing yourself a check from the business account or moving money between your personal and business accounts. If you're a sole member - you need not more than that. Make sure the operating agreement explicitly empowers you to do that, of course. There are no tax consequences, but as I mentioned - there may be legal consequences. If your business name is your name, you are automatically considered a sole-proprietorship and any income you generate and expenses you incur can be calculated on your personal tax return. You can use QuickTax Home & Business tax software to lead you through the steps; you don't even need an accountant. One drawback of a sole-proprietorship in your name is liability. You are personally responsible for the business because you are the business. If you get sued, you can lose everything. To limit that liability you can look into opening a corporation. If the corporation gets sued you are insulated from that; the corporation goes bankrupt, not you. A lawyer and an accountant will be required to give you solid advice on this direction. Your total salary deferral cannot exceed $18K (as of 2016). You can split it between your different jobs as you want, to maximize the matching.  You can contribute non-elective contribution on top of that, which means that your self-proprietorship will commit to paying you that portion regardless of your deferral. That would be on top of the $18K. You cannot contribute more than 20% of your earnings, though. So if you earn $2K, you can add $400 on top of the $18K limit (ignoring the SE tax for a second here). Keep in mind that if you ever have employees, the non-elective contribution will apply to them as well. Also, the total contribution limit from all sources (deferral, matching, non-elective) cannot exceed $53K (for 2016). "If you have a CPA working for you already - this is a question you should be asking that CPA. Generally, NOL only affects the tax stemming from the Internal Revenue Code (Title 26 Subtitle A of the US Code). Social Security and Medicare, while based on income, are not ""income tax"", these are different taxes stemming from different laws. Social Security and Medicare withheld from your salary are FICA taxes (Title 26 Subtitle C of the US Code). They're deducted at source and not on your tax return, so whatever changes you have in your taxable income on the tax return - FICA taxes are not affected by it. Self Employment tax (Schedule SE) on your Schedule C earnings in the carry-back years will also not be affected, despite being defined in the IRC, because the basis of the tax is the self-employment income while the carryback reduces the AGI." I would talk to your HMRC tax office they do have guidance on this issue here  http://www.hmrc.gov.uk/working/intro/employed-selfemployed.htm In Australia, any income you earn is taxable despite where it came from. Using your example your taxable income is $70,000. Keep in mind that with a business even as a sole trader any business expenses that contribute to the earning of your business income is deductible, reducing the final amount of tax you'll have to pay.  The ATO website has lots of good information and examples to look at including tax rates.  If your total income is pushing  into a higher tax bracket over 30c tax per $1 earned, it may be worth looking at shifting your business to operate under a company structure that just has a fixed tax rate around 30c per $1.  That said, for me, I don't want the paperwork overhead of a company yet so I'm running my side business as a sole trader too. I'd rather do that and keep it easy for now while my business gets profitable that waste time on admin structures for tax reasons even if in the shortterm it may mean slightly higher tax. In the end, you only pay tax on profit (income minus expenses) as opposed to raw/gross income.  For more info there are good books in the bookshops or local library (to read free) on starting a business on the side while still working. They discuss these issues too. "These kinds of questions can be rather tricky. I've struggled with this sort of thing in the past when I had income from a hobby, and I wanted to ensure that it was indeed ""hobby income"" and I didn't need to call it ""self-employment"". Here are a few resources from the IRS: There's a lot of overlap among these resources, of course. Here's the relevant portion of Publication 535, which I think is reasonable guidance on how the IRS looks at things: In determining whether you are carrying on an activity for profit, several factors are taken into account. No one factor alone is decisive. Among the factors to consider are whether: Most of the guidance looks to be centered around what one would need to do to convince the IRS that an activity actually is a business, because then one can deduct the ""business expenses"", even if that brings the total ""business income"" negative (and I'm guessing that's a fraud problem the IRS needs to deal with more often). There's not nearly as much about how to convince the IRS that an activity isn't a business and thus can be thrown into ""Other Income"" instead of needing to pay self-employment tax. Presumably the same principles should apply going either way, though. If after reading through the information they provide, you decide in good faith that your activity is really just ""Other income"" and not ""a business you're in on the side"", I would find it likely that the IRS would agree with you if they ever questioned you on it and you provided your reasoning, assuming your reasoning is reasonable. (Though it's always possible that reasonable people could end up disagreeing on some things even given the same set of facts.) Just keep good records about what you did and why, and don't get too panicked about it once you've done your due diligence. Just file based on all the information you know." This calculation arrives at the correct answer.  However, it uses the formula for an annuity due.  This means the payments are made at the beginning of the month and the last month of the 10 year period has interest accrued. See the section, Calculating the Future Value of an Annuity Due. The rate is given as an effective rate. with  In Excel, =FV((1+0.12)^(1/12)-1,120,3500,0,1)