Can my federal adjusted gross income differ by $1 between my federal and state returns?
No, you don't. Rounding errors happen, and if there's no change in the actual tax there's no reason to amend. If all the income was properly reported and the tax was properly calculated - no-one cares if it was rounded up or down on one of the lines. Note for the next time though: Not sure about New York, but Federal taxes are generally rounded to the nearest dollar on each line of the form. So don't calculate cents, just round to the nearest dollar, and be consistent on all of your tax forms. Technically, it is perfectly legal to report cents as well (and people used to when the forms were still filled by hand with pen), but all the automatic tax filing software rounds, so just do that.
Multistate Impact of the American Taxpayer Relief Act of 2012  In general, states with rolling conformity will follow this change. States with specific date conformity will continue  to follow the date of conformity currently in effect and will not follow the change. A few states may have their own  QSBS rules and will not conform to or be impacted by this provision of the Act. The chart that follows summarizes  these principles as applied to the enumerated states:  STATE: QSBS Exclusion Conformity:  California statutes refer to the IRC QSBS provisions but modify and limit their  applicability, and would not be impacted by this provision of the Act. However, California’s provisions were ruled unconstitutional in recent litigation and the California Franchise Tax Board has recently taken the position that gain exclusions  and deferrals will be denied for all open tax years. Florida Florida does not impose an income tax on individuals and therefore this provision of  the Act is inapplicable and will have no impact.  Illinois Due to its rolling conformity, Illinois follows this provision of the Act.  Because New York effectively provides for rolling conformity to the IRC, through  reference to federal adjusted gross income as the state starting point, New York  effectively follows this provision of the Act.  Texas does not impose an income tax on individuals I think you're making a mistake. If you still want to make this mistake (I'll explain later why I think its a mistake), the resources for you are: IRS.GOV - The IRS official web site, that has all the up-to-date forms and instructions for them, guiding publications and the relevant rules. You might get a bit overwhelmed through. Software programs - TurboTax (Home & Business for a sole propriator or single member LLC, Business for more complicated business), or H&R Block Business (only one version that should cover all) are for your guidance. They provide tips and interactive guidance in filling in all the raw data, and produce all the forms filled for you according to the raw data you entered. I personally prefer TurboTax, I think its interface is nicer and the workflow is more intuitive, but that's my personal preference. I wrote about it in my blog last year. Both also include plug-ins for the state taxes (If I remember correctly, for both the first state is included in the price, if you need more than 1 state - there's extra $30-$40 per state). Your state tax authority web site (Minnesota Department of Revenue in your case). Both Intuit and H&R Block have on-line forums where people answer each others questions while using the software to prepare the taxes, you might find useful information there. As always, Google is your friend. Now, why I think this is a mistake. Mistakes that you make - will be your responsibility. If you use the software - they'll cover the calculation mistakes. But if you write income in a wrong specification or take a wrong deduction that you shouldn't have taken - it will be on your head and you're the one to pay the fines and penalties for that. Missed deductions and credits - CPA's (should) know about all the latest deductions and credits that you or your business might be entitled to. They also (should) know which one got canceled and you shouldn't be continuing taking them if you had before. Expenses - there are plenty of rules of what can be written off as an expense and how. Some things should be written off this year, others over several years, for some depreciation formula should be used, etc etc. Tax programs might help you with that, but again - mistakes are your responsibility. Especially for the first time and for the newly formed business, I think you should use a (good!) CPA. The CPA should take responsibility over your filing. The CPA should provide guarantee that based on the documents you provided, he filled all the necessary forms correctly, and will absorb all the fees and penalties if there's an audit and mistakes were found not because you withheld information from your CPA, but because the CPA made a mistake. That costs money, and that's why the CPA's are more expensive than using a program or preparing yourself. But, the risk is much higher, especially for a new business. And after all - its a business expense. "Don't worry about it.  The State doesn't care about rounding error.  All you need to do is say ""We charge our prices with tax included"" - you know, like carnivals and movie theaters.   Then follow the procedures your state specifies for computing reportable tax.  Quite likely it wants your pre-tax sales total for the reporting period. To get that, total up your gross sales that you collected, and divide by (1 + tax rate).  Just like DJClayworth says, except do it on total sales instead of per-item.  If you need to do the split per-transaction for Quickbooks or something, that's annoying.  What Quickbooks says will be pennies off the method I describe above.  The state don't care as long as it's just pennies, or in their favor." It also depends on where you work. If you move your home and your job then the date you establish residency in the new state is the key date. All income before that date is considered income for state 1, and all income on or after that date is income for state 2.  If there is a big  difference in income you will want to clearly establish residency because it impacts your wallet. If they had the same rates moving wouldn't impact your wallet, but it would impact each state. So make sure when going from high tax state to low tax state that you register your vehicles, register to vote, get a new drivers license... It becomes more complex if you move your home but not your job. In that case where you work might be the deciding factor. Same states have agreed that where you live is the deciding factor; in other cases it is not. For Virginia, Maryland, and DC you pay based on where you live if the two states involved are DC, MD, VA. But if you Live in Delaware and work in Virginia Virginia wants a cut of your income tax.  So before you move you need to research reciprocity for the two states. From Massachusetts information for Nonresident and Part-Year Resident Income, Exemptions, Deductions and Credits Massachusetts gross income includes items of income derived from   sources within Massachusetts. This includes income: a few questions later: Massachusetts residents and part-year residents are allowed a credit   for taxes due to any other jurisdiction. The credit is available only   on income reported and taxed on a Massachusetts return. Nonresidents   may not claim the taxes paid to other jurisdiction credit on their   Massachusetts Form 1-NR/PY. The credit is allowed for income taxes paid to: The credit is not allowed for: taxes paid to the U.S. government or a   foreign country other than Canada; city or local tax; and interest and   penalty paid to another jurisdiction. The computation is based on comparing the Massachusetts income tax on   income reported to the other jurisdiction to the actual tax paid to   the other jurisdiction; the credit is limited to the smaller of these   two numbers. The other jurisdiction credit is a line item on the tax form but you   must calculate it on the worksheet in the instruction booklet and also   enter the credit information on the Schedule OJC. So if you move your house to New Hampshire, but continue to work in Massachusetts you will owe income tax to Massachusetts  for that income even after you move and establish residency in New Hampshire. If you qualify for the safe harbor, you are not required to pay additional quarterly taxes.  Of course, you're still welcome to do so if you're sure you'll owe them; however, you will not be penalized. If your income is over $150k (joint) or $75k (single), your safe harbor is: Estimated tax safe harbor for higher income taxpayers. If your 2014 adjusted gross income was more than $150,000 ($75,000 if you are married filing a separate return), you must pay the smaller of 90% of your expected tax for 2015 or 110% of the tax shown on your 2014 return to avoid an estimated tax penalty. Generally, if you're under that level, the following reasons suggest you will not owe the tax (from the IRS publication 505): The total of your withholding and timely estimated tax payments was at least as much as your 2013 tax. (See Special rules for certain individuals for higher income taxpayers and farmers and fishermen.) The tax balance due on your 2014 return is no more than 10% of your total 2014 tax, and you paid all required estimated tax payments on time. Your total tax for 2014 (defined later) minus your withholding is less than $1,000. You did not have a tax liability for 2013. You did not have any withholding taxes and your current year tax (less any household employment taxes) is less than $1,000. If you paid one-fourth of your last year's taxes (or of 110% of your last-year's taxes) in estimated taxes for each quarter prior to this one, you should be fine as far as penalties go, and can simply add the excess you know you will owe to the next check. Your withholding is taken out of your pay. So if you do YTD+withholding - you count the withholding twice, that's why it doesn't add up for you. The simple answer is to check your written contract/offer letter. See if it matches what you see, or what you expected to see. If the offer/contract states $36K - check with the payroll person at work why the discrepancy. If you don't have any written proof of the agreed amounts (don't know if it is legal, check local laws on the requirements of documenting employment terms), then it is up to you and your employer to sort it out. However, keep in mind: if you don't have any written proof and the employer is unwilling to adjust - one (judge?) would wonder: you've been getting paychecks monthly, which clearly state that your annual salary is $35K. Why did you wait so long to sort this out? This is wrong.  It should be  or  Now, to get back to self-employment tax.  Self-employment tax is weird.  It's a business tax.  From the IRS perspective, any self-employed person is a business.  So, take your income X and divide by 1.0765 (6.2% Social Security and 1.45% Medicare).  This gives your personal income.  Now, to calculate the tax that you have to pay, multiply that by .153 (since you have to pay both the worker and employer shares of the tax).   So new calculation  or they actually let you do  which is better for you (smaller).   And your other calculations change apace.   And like I said, you can simplify Q1se to  and your payment would be  Now, to get to the second quarter.  Like I said, I'd calculate the income through the second quarter.  So recalculate A based on your new numbers and use that to calculate Q2i.   or  Note that this includes income from both the first and second quarters.  We'll reduce to just the second quarter later.  This also has you paying for all of June even though you may not have been paid when you make the withholding payment.  That's what they want you to do.   But we aren't done yet.  Your actual payment should be  or  Because Q2ft and Q2se are what you owe for the year so far.  Q1ft + Q1se is what you've already paid.  So you subtract those from what you need to pay in the second quarter.  In future quarters, this would be  All that said, don't stress about it.  As a practical matter, so long as you don't owe $1000 or more when you file your actual tax return, they aren't going to care.  So just make sure that your total payments match by the payment you make January 15th.   I'm not going to try to calculate for the state.  For one thing, I don't know if your state uses Q1i or Q1pi as its base.  Different states may have different rules on that.  If you can't figure it out, just use Q1i, as that's the bigger one.  Fix it when you file your annual return.  The difference in withholding is going to be relatively small anyway, less than 1% of your income. Using a different cost basis than your broker's reporting is NOT a problem. You need to keep your own records to account for this difference. Among the other many legitimate reasons to adjust your cost basis, the most popular is when you have two brokerage accounts and sell an asset in one then buy in another. This is called a Wash Sale and is not a taxable event for you. However from the perspective of each broker with their limited information you are making a transaction with tax implications and their reported 1099 will show as such. Links:  https://www.firstinvestors.com/docs/pdf/news/tax-qa-2012.pdf LLC is not a federal tax designation.  It's a state-level organization. Your LLC can elect to be treated as a partnership, a disregarded entity (i.e., just report the taxes in your individual income tax), or as an S-Corp for federal tax purposes. If you have elected S-Corp, I expect that all the S-Corp rules will apply, as well as any state-level LLC rules that may apply.   Disclaimer: I'm not 100% familiar with S-corp rules, so I can't evaluate whether the statements you made about proportional payouts are correct. States have made sales tax more confusing by expanding some categories and shrinking or eliminating other categories. In days of old there were taxes on items, and specific taxes on other small categories such as fuel and cigarets . In many states there were taxes implemented state wide, and in other cases they only applied to a specific city or region. As time went on taxes could be raised to bring in more money for the state or local government, but these tax increase were seen as unfair to the poor. So now the states are modifying and tweaking the tax rates. Some items are tax free, some have a low tax, and some are at the full tax rate. This can get confusing because the type of store can also play a factor. A bag a chips from a grocery store can be treated  differently than a bag of chips from a hotdog stand. Some states have also added special taxes on snack foods. In general, purchases they want to encourage (staples from the grocery store) are tax free or low tax, items they don't want to encourage (snacks) are fully taxed. You can also be sure that they will treat luxury items as fully taxed. A new frontier of taxation are ones designed to tax people who don't live there. They have added taxes on restaurants and  hotels. Since they are paid by tourists, the people most likely to pay them don't have a voice in setting the rate.  States are now wanting to tax services as a way to make up shortfalls in taxing.  Don't expect consistency from state to state, or year to year.  Oh by the way that penny tax was for something that cost 17 cents or less, unless that item had a lower tax rate. The receipt should clearly identify the taxable items, and their tax level. I was specifically talking about property tax which doesn't increase that much with income. But state and local income taxes ratio makes a lot of sense since there are still lots of people that depend on a salary at 1million$ AGI. This sort of involves personal finance, and sort of not. But it's an interesting question, so let's call it on topic? Short answer: yes. Long answer: it depends who's asking. If you're trying to qualify for in-state tuition, for example, you need to have been in state for a certain amount of time. For tax purposes, the first year you move to a new state you need to file part-time resident returns in your previous and current state of residency Ask the company if they can make an adjustment for the next paycheck. If they can't then do the following: Increase the number of Federal exemptions by 1. In 2014 a personal exemption reduces your apparent income by $3950.  If you are in the 10 % tax bracket and you are paid every two weeks you will see the amount of taxes withheld drop by ($3950*0.10/26) or ~$15. The 13 Paychecks later change it back. If you are in the 15 % tax bracket and you are paid every two weeks you will see the amount of taxes withheld drop by ($3950*0.15/26) or ~$23. Then 9 Paychecks later change it back If you are in the 25 % tax bracket and you are paid every two weeks you will see the amount of taxes withheld drop by ($3950*0.10/26) or ~$38. Then 5 paychecks later change it back. Remember the money isn't gone, it has just been transferred prematurely to the federal treasury.  You could also wait until you complete your taxes this spring, then see if you needed to make an adjustment to your exemptions. If you normally get a large refund then you should be increasing your exemptions anyway. If you are always writing a check to the IRS then you weren't getting enough withheld. Also make sure that payroll has the correct numbers. Most companies include the number of federal and state exemptions on the paycheck stub, or the pdf of the stub. To start with, I should mention that many tax preparation companies will give you any number of free consultations on tax issues — they will only charge you if you use their services to file a tax form, such as an amended return. I know that H&R Block has international tax specialists who are familiar with the issues facing F-1 students, so they might be the right people to talk about your specific situation. According to TurboTax support, you should prepare a completely new 1040NR, then submit that with a 1040X. GWU’s tax department says you can submit late 8843, so you should probably do that if you need to claim non-resident status for tax purposes. didn't pay the extra underpayment penalty on the grounds that it was   an honest mistake. You seem to think a penalty applies only when the IRS thinks you were trying to cheat the system.  That's not the case. A mistake (honest or otherwise) still can imply a penalty. While you can appeal just about anything, on any grounds you like, it's unlikely you will prevail.