$65000/year or $2500 every two weeks: If I claim 3 exemptions instead of zero, how much would my take home pay be?
"Take a look at IRS Publication 15. This is your employer's ""bible"" for withholding the correct amount of taxes from your paycheck. Most payroll systems use what this publication defines as the ""Percentage Method"", because it requires less data to be entered into the system in order to correctly compute the amount of withholding. The computation method is as follows: Taxes are computed ""piecewise""; dollar amounts up to A are taxed at X%, and then dollar amounts between A and B are taxed at Y%, so total tax for B dollars is A*X + (B-A)*Y. Here is the table of rates for income earned in 2012 on a daily basis by a person filing as Single: To use this table, multiply all the dollar amounts by the number of business days in the pay period (so don't count more than 5 days per week even if you work 6 or 7). Find the range in which your pay subject to withholding falls, subtract the ""more than"" amount from the range, multiply the remainder by the ""W/H Pct"" for that line, and add that amount to the ""W/H Base"" amount (which is the cumulative amount of all lower tax brackets). This is the amount that will be withheld from your paycheck if you file Single or Married Filing Separately in the 2012 TY. If you file Married Filing Jointly, the amounts defining the tax brackets are slightly different (there's a pretty substantial ""marriage advantage"" right now; withholding for a married person in average wage-earning range is half or less than a person filing Single.). In your particular example of $2500 biweekly (10 business days/pp), with no allowances and no pre-tax deductions: So, with zero allowances, your employer should be taking $451.70 out of your paycheck for federal withholding. Now, that doesn't include PA state taxes of 3.07% (on $2500 that's $76.75), plus other state and federal taxes like SS (4.2% on your gross income up to 106k), Medicare/Medicaid (1.45% on your entire gross income), and SUTA (.8% on the first $8000). But, you also don't get a refund on those when you fill out the 1040 (except if you claim deductions against state income tax, and in an exceptional case which requires you to have two jobs in one year, thus doubling up on SS and SUTA taxes beyond their wage bases). If you claim 3 allowances on your federal taxes, all other things being equal, your taxable wages are reduced by $438.45, leaving you with taxable income of $2061.55. Still in the 25% bracket, but the wages subject to that level are only $619.55, for taxes in the 25% bracket of $154.89, plus the withholding base of $187.20 equals total federal w/h of $342.09 per paycheck, a savings of about $110pp. Those allowances do not count towards other federal taxes, and I do not know if PA state taxes figure these in. It seems odd that you would owe that much in taxes with your withholding effectively maxed out, unless you have some other form of income that you're reporting such as investment gains, child support/alimony, etc. With nobody claiming you as a dependent and no dependents of your own, filing Single, and zero allowances on your W-4 resulting in the tax withholding above, a quick run of the 1040EZ form shows that the feds should owe YOU $1738.20. The absolute worst-case scenario of you being claimed as a dependent by someone else should still get you a refund of $800 if you had your employer withhold the max. The numbers should only have gotten better if you're married or have kids or other dependents, or have significant itemized deductions such as a home mortgage (on which the interest and any property taxes are deductible). If you itemize, remember that state income tax, if any, is also deductible. I would consult a tax professional and have him double-check all your numbers. Unless there's something significant you haven't told us, you should not have owed the gov't at the end of the year." I use paycheckcity.com and first punch in my paycheck and make sure it calculates within a few pennies the value of my actual paycheck. Then I fiddle with withholding values, etc. to see the effect of change.  It has been very effective for me over the years. It will usually take a week or two for changes to your withholding to take effect in payroll.  However 0 deductions will withhold more per check than 3.  So if at 0 deductions you are having to pay in April then I would suggest not changing your W2 to 3 deductions.  Instead in the section for extra with holding add $25 per week.  This should leave you with a more manageable return in April.
"Will the proportion of my payments towards interest eventually go down?  Yes. Today would be a good day to do a web search for ""amortization schedule"". You will quickly learn how to compute precisely how much of each payment goes to interest and how much goes to principal given different payment choices. Would it be wiser to spend more each month on loan payments? That depends on your goals and resources, which we know nothing about. If you have extra money you could spend it on debt reduction, or you could spend it on an investment that pays more money in growth or dividends than the interest you'd save. Or you could decide that the longer you have that loan, sure, the more interest you'll pay, but inflation will make future money less valuable. Basically, by taking out a loan you have chosen to gamble that the thing you bought with the loaned money will be worth the cost of the interest payments in the future, adjusted for inflation. The bank on the other hand is gambling that you're good for the debt and that they can make a reasonable profit off it. If you have more money to gamble with, which bet is the wisest one is really up to you. would it be smarter to try to pay off one loan before the other? If you want to pay off a loan early then always choose the loan with the higher interest rate. should I start making bi-weekly payments instead of monthly? That's roughly equivalent to paying off the principal by one additional payment a year. There are two reasons to do so.  The first is that the total interest will be lower and the loan will be paid off faster. You can work out exactly how much with your new found skill at amortization computation.   The second is the simple convenience of knowing that your budget for each pay period is the same.  That convenience is worth something; is it worth the amount extra you'll be paying every year? Again, this is for you to decide. Work out how much extra you're paying per year and how much you're saving in the long run, and compare that against the benefit." I'm concerned about your extreme focus on Roth. In today's dollars it would take nearly $2 million to produce enough of an annual withdrawal to fill the 15% bracket. If you are able to fund both 401(k)s and 2 IRAs (total $43K) you're clearly in the 25% bracket or higher. If you retire 100% with Roth savings, and little to no pretax money, you miss the opportunity to receive withdrawals at zero(1), 10, and 15% brackets. Missing this isn't much better than having too much pretax and being in a higher bracket at retirement.  One factor often overlooked is that few people manage a working life with no gaps. During times when income is lower for whatever reason, it's a great time to convert a bit to Roth.  (1)by zero bracket, I mean the combined standard deduction and exemptions. For two people this is currently (for 2017) $20,800 total. And it goes up a bit most years. One point that I don't see covered in the other answers yet: How does this affect the months that have 5 weeks. Do we actually lose two weeks a year? I get paid every two weeks, and pay day is always a Friday.  Some months, I get paid 3 times - which is always great.  If you live within your means, it's like an extra paycheck.  All other months, I get paid two times.  How many months a year do I get paid 3 times? 2.  It will always be two, because there are 12 months.  If you get paid twice a month, that's 24 pay checks, which is 2 shy of 26 pay checks - what we would expect if we were paid every two weeks.  That means those 2 extra pay checks need to fall somewhere, and they will be on the months where your pay day is hit 5 times.  For example, in 2014, there are 4 months with 5 Fridays: Jan May Aug Oct  I got paid the second Friday of January, so I only got 2 checks in January.  I will be paid on the first Friday of May, which means I will get 3 checks in May.  My other triple-check month this year is October, so of course I am only going to be paid twice in August. "Short answer:  No. Longer answer:  The only reason to move would be to get out of the condo and into a SFR of equal cost because condos can be quite difficult to sell and you don't really want that potential burden later on.  Moving is expensive though and you can't afford to spend more when you are already living on the financial edge. Speaking of living on the edge, that's a recipe for disaster.  I make, ratio-wise, a similar sort of income.  Even accounting for the generous college tuition, you should be able to save at least $20K per year...at a bare minimum.  And if you were careful, I figure you should be able to save $40K/year.  You need to figure out where you are dumping all of your money and cut WAY back on spending and focus entirely on saving money. 1)  Stop eating out.  Make your own meals.  I average about $2 per meal per person - no junk food.  Eating out is 6 to 30 times as expensive as making meals at home.  Do the math:  $10 * 2 people * number of times you eat out per week * 52 ($1,040 per year for each time/week!) vs $2 * 2 people * 21 (3 meals per day) * 52 ($4,368 per year for both of you...maximum).  Now I know some meals are more expensive to prepare, but the math is not unrealistic - I spend about $140 per month on groceries and make the bulk of my own food.  Eating out is sticker shock for me.  The food I prepare is nutritionally balanced and complete.  Now I'm not a complete health-nut.  I love the occasional deep-fried treat or hamburger, but those are ""once every couple of months"" sort of things, which makes them special. 2)  Stop going to Starbucks or wherever you habitually go.  It takes fuel to get there.  It's also expensive when you get there.  Bring your own drink if you are hanging out with friends. 3)  Drop golf.  Or whatever expensive sport you are sinking money into.  Invest in some cheap running clothes and focus on cardio-based workouts.  Heart health is more important than anything else.  If you can't live without your sport, then find an alternate sport that is ""equal""-ish in challenge but a ton cheaper to play.  For example, if you like playing golf, play discgolf instead (most cities have courses) - there's no cost beyond a couple of discs and the challenge is still there. 4)  Drop entertainment.  Movies at the theater are expensive.  Drop your cable subscription (you are getting financially raped for $1,500/year).  Get a Netflix subscription and find shows via free online streaming services.  Buy some dominoes, card games, and a couple of classic board games.  Keep entertainment simple and cheap. 5)  Drop your cell phone's data plan.  Republic Wireless is the only decent cellular provider and even their $12/month plan is living a luxury lifestyle.  If you spend more than $10/month/person for phone service, you are spending too much. 6)  Stop driving everywhere.  Gas is expensive.  Cars are expensive.  If you have more than two cars, sell the extras.  If your car is worth more than $20,000, sell it and get something cheaper. 7)  Stop drinking alcohol.  Alcohol impairs mental functions, is addictive, smells terrible, and is ridiculously expensive.  There's no actual need to consume it either. By the way, don't go and make major financial changes without the wife's sign-off.  Finances are the #1 reason for divorce.  So get her ""OK"" on this stuff.  Hopefully you already knew that.  The above are just some common financial pitfalls where people sink thousands and thousand of dollars and gain nothing.  You can still have a full and complete life with just a minimum of the above. There is no excuse for living on the edge financially.  Your story is one I'm going to share with those who give me the same excuse because they are ""poor"".  You are ""I want to punch you in the face"" wealthy and you spend every last penny because you think that's how money works.  You are wrong. One final piece of advice:  Find a financial adviser.  It is clear to me that you've been managing money wrong your whole life.  A financial adviser will look at your situation and help you far more than someone on the Internet ever can.  If you attend a church, many churches have the excellent Crown Financial Ministries program available which teaches sound financial management principles.  The education system doesn't show people how to manage money, but that's not an excuse either.  Once you dig yourself out of the financial hole you've dug for yourself, you can pass the knowledge on how to correctly manage money onto other people." Follow the instructions on the W-4. It says exactly how you are supposed to calculate the number of allowances. You shouldn't have to figure out how to get the right number. Just follow the instructions. The only part at all complex is if you have large deductions. In that case you're supposed to subtract a standard amount from your actual deductions -- for 2017, $12,700 if married filing jointly -- divide by $4,050, and then add the result to the number of allowances. In general, following the instructions on the W-4 should result in slightly more tax being withheld from your paycheck than you actually owe, so that you get a modest refund next April 15. In the long run it doesn't matter if you have too much withheld, as you'll get it all back eventually anyway. I suppose the withholding could be so high that it doesn't leave you enough to live on while waiting for your refund, but that shouldn't normally be the case. If you pay too little, you could be subject to penalties and interest, so you really want to avoid that. Your question is unclear about whether you are moving from bi-weekly payments or to bi-weekly payments. Let's calculate each case. Bi-weekly pay means you will be paid every two weeks. The amount for each payment will be your annual salary divided by 26, possibly with a small decrease (around 0.3%) to account for the fact that years are slightly longer than 52 weeks (i.e. there are slightly more than 26 two-week periods in a year), and possibly an even smaller adjustment to take account of the fact that some years are a day longer than that. You will be paid literally every 14 days (with some adjustments if a payday falls on a holiday) If you are going to be paid twice a month, then each payment will be your annual salary divided by 24. Typically you are paid on the same days of each month - for example the 1st and the fifteenth, or the last business day before those. Math time.  24 means 2 years out of college, or 6 years out of highschool, the latter being much more plausible given the poster's content quality.  $100k / 6 = $16.7k/year  16.7k / 52 weeks = $321/week  $321 / (11/hr * (1 - 15% taxes)) = 34 hours per week.  So he worked 34 hours per week, without fail, for 6 years, with NO expenses of any kind whatsoever.   OR, much more likely, he managed to save only $10k, not $100k in 6 years. The purpose of the W-4 form is to allow you to adjust the withholding to meet your tax obligations. If you have outside non-wage income (money from tutoring) you will have to fill out the W-4 to have extra taxes withheld. If you have deductions (kids, mortgages, student loan interest) then you need to adjust the form to have less tax taken out. Now if yo go so far that you owe too much in April, then you can get hit with penalties and a requirement to file your taxes quarterly the next year. Most years I adjust my W-4 to reflect changes to my situation. The idea is to use it to manage your withholding so that you minimize your refund without triggering the penalties. The HR department has advised you well. How to adjust: If you want to decrease withholding (making the refund smaller) add one to the number on the worksheet. In 2014 a change by 1 exemption is equal to a salary adjustment of  $3,950. If this was spread over 26 paychecks that would be the same as lowering your salary by ~$152. If you are in the 15% tax bracket that increases your take home pay by ~10 a check.