Using 2 different social security numbers
While I agree with keshlam@ that the gym had no reason (or right) to ask for your SSN, giving false SSN to obtain credit or services (including gym membership) may be considered a crime. While courts disagree on whether you can be charged with identity theft in this scenario, you may very well be charged with fraud, and if State lines are crossed (which in case of store cards is likely the case) - it would be a Federal felony charge. Other than criminal persecution, obviously not paying your debt will affect your credit report. Since you provided false identity information, the negative report may not be matched to you right away, but it may eventually. In the case the lender discovers later that you materially misrepresented information on your mortgage application - they may call on your loan and either demand repayment in full at once or foreclose on you. Also, material misrepresentation of facts on loan application is also a criminal fraud. Again, if State lines are crossed (which in most cases, with mortgages they are), it becomes a Federal wire fraud case. On mortgage application you're required to disclose your debts, and that includes lines of credits (store cards and credit cards are the same thing) and unpaid debts (like your gym membership, if its in collection). "Social security number should only be needed for things that involve tax withholding or tax payment. Your bank or investment broker, and your employer, need it so they can report your earnings. You need it when filing tax forms. Other than those, nobody should really be asking you for it.  The gym had absolutely no good reason to ask and won't have done anything with the number. I think we can ignore that one. The store cards are a bigger problem. Depending on exactly what was done with the data, you may have been messing up the credit record of whoever legitimately had that number... and if so you might be liable on fraud charges if they or the store figure out what happened and come after you. But that's unrelated to the fact that you have a legitimate SSN now. Basically, you really don't want to open this can of worms. And I hope you're posting from a disposable user ID and not using your real name... (As I noted in a comment, the other choice would be to contact the authorities (I'm not actually sure which bureau/department would be best), say ""I was young, foolish, and confused by America's process... do I need to do anything to correct this?"", and see what happens... but it might be wise to get a lawyer's advice on whether that's a good idea, a bad idea, or simply unnecessary.)"
If you've already used TurboTax on your 2015 taxes, you can use the numbers TurboTax gave you as your reasonable estimate.  Line 4 is your estimate of total tax liability for 2015. This would be line 63 of form 1040. This is Federal income tax only, not Social Security tax.  Line 5 is the total of tax payments you made last year. You should be able to read this off your W-2 forms, Box 2. It corresponds to line 74 on the 1040.  Line 6 is the difference between lines 4 and 5. You can't claim a refund on the extension, so if line 5 is more than line 4, enter 0. Otherwise, subtract line 5 from line 4, and enter it in line 6. This is the amount you should send in with the form to minimize any penalty due with your taxes later.  The TurboTax software can generate this extension form automatically, I believe.  Also, don't forget to give a copy of this extension form to your tax preparer. He will need to know the amount you sent in. If a bank is evaluating a persons qualifications to qualify for a loan they have to follow the FDIC and HUD guidelines for equal opportunity credit. If they offer mortgages they will use the phrase equal housing. from the lending club website (fine print area): 2 This depiction is a summary of the processes for obtaining a loan or   making an investment. Loans are issued by WebBank, an FDIC insured   Utah-chartered industrial bank located in Salt Lake City, Utah, Equal   Housing Lender. Investors do not invest directly in loans. Investors   purchase Member Dependent Notes from Lending Club. Loans are not   issued to borrowers in IA and ID. Individual borrowers must be a US   citizen or permanent resident and at least 18 years old. Valid bank   account and social security number/FEIN are required. All loans are   subject to credit review and approval. Your actual rate depends upon   credit score, loan amount, loan term, credit usage and history.   LendingClub notes are issued pursuant to a Prospectus on file with the   SEC. You should review the risks and uncertainties described in the   Prospectus related to your possible investment in the notes. Currently   only residents of the following states may invest in Lending Club   notes: AR, AZ, CA, CO, CT, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA,   MA, ME, MN, MO, MS, MT, NE, NH, NV, NY, OK, RI, SC, SD, TN, TX, UT,   VA, VT, WA, WI, WV, or WY. Our mailing address is: Lending Club, 71   Stevenson, Suite 300, San Francisco, CA 94105. In general  What does this mean? Assume 10 holidays and 2 weeks of vacation. So you will report to the office for 240 days (48 weeks * 5 days a week).  If you are a w2 they will pay you for 260 days (52 weeks * 5 days a week). At $48 per hour you will be paid: 260*8*48 or $99,840. As a 1099 you will be paid 240*8*50 or 96,000. But you still have to cover insurance, the extra part of social security, and your retirement through an IRA. A rule of thumb I have seen with government contracting is that If the employee thinks that they make X,000 per year the company has to bill X/hour to pay for wages, benefits, overhead and profit. If the employee thinks they make x/hour the company has to bill at 2X/hour. When does a small spread make sense: The insurance is covered by another source, your spouse; or government/military retirement program.  Still $2 per hour won't cover the 6.2%  for social security. Let alone the other benefits. The IRS has a checklist to make sure that a 1099 is really a 1099, not just a way for the employer to shift the costs onto the individual. "I've done various side work over the years -- computer consulting, writing, and I briefly had a video game company -- so I've gone through most of this. Disclaimer: I have never been audited, which may mean that everything I put on my tax forms looked plausible to the IRS and so is probably at least generally right, but it also means that the IRS has never put their stamp of approval on my tax forms. So that said ... 1: You do not need to form an LLC to be able to claim business expenses. Whether you have any expenses or not, you will have to complete a schedule C. On this form are places for expenses in various categories. Note that the categories are the most common type of expenses, there's an ""other"" space if you have something different. If you have any property that is used both for the business and also for personal use, you must calculate a business use percentage. For example if you bought a new printer and 60% of the time you use it for the business and 40% of the time you use it for personal stuff, then 60% of the cost is tax deductible. In general the IRS expects you to calculate the percentage based on amount of time used for business versus personal, though you are allowed to use other allocation formulas. Like for a printer I think you'd get away with number of pages printed for each. But if the business use is not 100%, you must keep records to justify the percentage. You can't just say, ""Oh, I think business use must have been about 3/4 of the time."" You have to have a log where you write down every time you use it and whether it was business or personal. Also, the IRS is very suspicious of business use of cars and computers, because these are things that are readily used for personal purposes. If you own a copper mine and you buy a mine-boring machine, odds are you aren't going to take that home to dig shafts in your backyard. But a computer can easily be used to play video games or send emails to friends and relatives and lots of things that have nothing to do with a business. So if you're going to claim a computer or a car, be prepared to justify it. You can claim office use of your home if you have one or more rooms or designated parts of a room that are used ""regularly and exclusively"" for business purposes. That is, if you turn the family room into an office, you can claim home office expenses. But if, like me, you sit on the couch to work but at other times you sit on the couch to watch TV, then the space is not used ""exclusively"" for business purposes. Also, the IRS is very suspicious of home office deductions. I've never tried to claim it. It's legal, just make sure you have all your ducks in a row if you claim it. Skip 2 for the moment. 3: Yes, you must pay taxes on your business income. If you have not created an LLC or a corporation, then your business income is added to your wage income to calculate your taxes. That is, if you made, say, $50,000 salary working for somebody else and $10,000 on your side business, then your total income is $60,000 and that's what you pay taxes on. The total amount you pay in income taxes will be the same regardless of whether 90% came from salary and 10% from the side business or the other way around. The rates are the same, it's just one total number. If the withholding on your regular paycheck is not enough to cover the total taxes that you will have to pay, then you are required by law to pay estimated taxes quarterly to make up the difference. If you don't, you will be required to pay penalties, so you don't want to skip on this. Basically you are supposed to be withholding from yourself and sending this in to the government. It's POSSIBLE that this won't be an issue. If you're used to getting a big refund, and the refund is more than what the tax on your side business will come to, then you might end up still getting a refund, just a smaller one. But you don't want to guess about this. Get the tax forms and figure out the numbers. I think -- and please don't rely on this, check on it -- that the law says that you don't pay a penalty if the total tax that was withheld from your paycheck plus the amount you paid in estimated payments is more than the tax you owed last year. So like lets say that this year -- just to make up some numbers -- your employer withheld $4,000 from your paychecks. At the end of the year you did your taxes and they came to $3,000, so you got a $1,000 refund. This year your employer again withholds $4,000 and you paid $0 in estimated payments. Your total tax on your salary plus your side business comes to $4,500. You owe $500, but you won't have to pay a penalty, because the $4,000 withheld is more than the $3,000 that you owed last year. But if next year you again don't make estimated payment, so you again have $4,000 withheld plus $0 estimated and then you owe $5,000 in taxes, you will have to pay a penalty, because your withholding was less than what you owed last year. To you had paid $500 in estimated payments, you'd be okay. You'd still owe $500, but you wouldn't owe a penalty, because your total payments were more than the previous year's liability. Clear as mud? Don't forget that you probably will also owe state income tax. If you have a local income tax, you'll owe that too. Scott-McP mentioned self-employment tax. You'll owe that, too. Note that self-employment tax is different from income tax. Self employment tax is just social security tax on self-employed people. You're probably used to seeing the 7-whatever-percent it is these days withheld from your paycheck. That's really only half your social security tax, the other half is not shown on your pay stub because it is not subtracted from your salary. If you're self-employed, you have to pay both halves, or about 15%. You file a form SE with your income taxes to declare it. 4: If you pay your quarterly estimated taxes, well the point of ""estimated"" taxes is that it's supposed to be close to the amount that you will actually owe next April 15. So if you get it at least close, then you shouldn't owe a lot of money in April. (I usually try to arrange my taxes so that I get a modest refund -- don't loan the government a lot of money, but don't owe anything April 15 either.) Once you take care of any business expenses and taxes, what you do with the rest of the money is up to you, right? Though if you're unsure of how to spend it, let me know and I'll send you the address of my kids' colleges and you can donate it to their tuition fund. I think this would be a very worthy and productive use of your money. :-) Back to #2. I just recently acquired a financial advisor. I can't say what a good process for finding one is. This guy is someone who goes to my church and who hijacked me after Bible study one day to make his sales pitch. But I did talk to him about his fees, and what he told me was this: If I have enough money in an investment account, then he gets a commission from the investment company for bringing the business to them, and that's the total compensation he gets from me. That commission comes out of the management fees they charge, and those management fees are in the same ballpark as the fees I was paying for private investment accounts, so basically he is not costing me anything. He's getting his money from the kickbacks. He said that if I had not had enough accumulated assets, he would have had to charge me an hourly fee. I didn't ask how much that was. Whew, hadn't meant to write such a long answer!" The loss for B can be used to write off the gain for A.  You will fill out a schedule 3 with cost base and proceeds of disposition.  This will give you a $0 capital gain for the year and an amount of $5 (50% of the $10 loss) you can carry forward to offset future capital gains.  You can also file a T1-a and carry the losses back up to 3 years if you're so inclined.  It can't be used to offset other income (unless you die). Your C and D trades can't be on income account except for very unusual circumstances.  It's not generally acceptable to the CRA for you to use 2 separate accounting methods.  There are some intricacies but you should probably just use capital gains.   There is one caveat that if you do short sales of Canadian listed securities, they will be on income account unless you fill out form T-123 and elect to have them all treated as capital gains. I just remembered one wrinkle in carrying forward capital losses.  They don't reduce your capital gains anymore, but they reduce your taxable income.  This means your net income won't be reduced and any benefits that are calculated from that (line 236), will not get an increase. "You can do either a 1099 or a W-2.  There is no limitations to the number of W-2s one can have in reporting taxes.  Problems occur, with the IRS, when one ""forgets"" to report income.  Even if one holds only one job at a time, people typically have more than one W-2 if they change jobs within the year. The W-2 is the simplest way to go and you may want to consider doing this if you do not intend to work this side business into significant income.   However, a 1099 gig is preferred by many in some situations.  For things like travel expenses, you will probably receive the income from these on a 1099, but you can deduct them from your income using a Schedule C.  Along these lines you may be able to deduct a wide variety of other things like travel to and from the client's location, equipment such as computers and office supplies, and maybe a portion of your home internet bill.  Also this opens up different retirement contributions schemes such as a simplified employee pension.   This does come with some drawbacks, however.  First your life is more complicated as things need to be documented to become actual business expenses.  You are much more likely to be audited by the IRS.  Your taxes become more complicated and it is probably necessary to employee a CPA to do them.  If you do this for primary full time work you will have to buy your own benefits.  Most telling you will have to pay both sides of social security taxes on most profits.  (Keep in mind that a good account can help you transfer profits to dividends which will allow you to be taxed at 15% and avoid social security taxes.) So it really comes down to what you see this side gig expanding into and your goals.  If you want to make this a real business, then go 1099, if you are just doing this for a fes months and a few thousand dollars, go W-2." "In double-entry bookkeeping, no transaction is ever negative. You only deal in positive numbers. We ""simulate"" negative numbers by calling numbers debits and credits, where one is the negative of the other. Only a balance can be negative. In this case, Income is a credit account. That means that things that increase your balance are credits and things that reduce your balance are debits. So a gift from grandma is a credit. It's a positive number, and you write it in the credit column. You pretty much never subtract from Income except to correct a mistake. Assets, like a checking account, are debit accounts. Increases are debits and decreases are credits. You routinely have both debits and credits on a checking account, i.e. you put money in and you take money out. Every transaction affects (at least) two accounts: one with a debit and one with a credit. So in this case, the gift from grandma credits income and debits checking. Buying food credits checking and debits expenses." According to the IRS:  Aliens who are not eligible to apply for a U.S. social security   number, or who do not meet the Social Security Administration's   evidence requirements for an SSN, may apply for an Individual Taxpayer   Identification Numbers (ITIN) from the Internal Revenue Service if   they have a valid tax reason for needing an ITIN, as explained in the   Form W-7 instructions. Seeing as you don't have a valid tax reason for an ITIN, your request will probably be denied by the IRS.