Calculate time to reach investment goals given starting balance?
The Finance functions in spreadsheet software will calculate this for you.  The basic functions are for Rate, Payment, PV (present value), FV (Future value), and NPER, the number of periods.  The single calculation faces a couple issues, dealing with inflation, and with a changing deposit. If you plan to save for 30 years, and today are saving $500/mo, for example, in ten years I hope the deposits have risen as well. I suggest you use a spreadsheet, a full sheet, to let you adjust for this.  Last, there's a strange effect that happens. Precision without accuracy. See the results for 30-40 years of compounding today's deposit given a return of 6%, 7%, up to 10% or so. Your forecast will be as weak as the variable with the greatest range. And there's more than one, return, inflation, percent you'll increase deposits, all unknown, and really unknowable.  The best advice I can offer is to save till it hurts, plan for the return to be at the lower end of the range, and every so often, re-evaluate where you stand. Better to turn 40, and see you are on track to retire early, than to plan on too high a return, and at 60 realize you missed it, badly.  As far as the spreadsheet goes, this is for the Google Sheets -  Type this into a cell =nper(0.01,-100,0,1000,0) It represents 1% interest per month, a payment (deposit) of $100, a starting value of $0, a goal of $1000, and interest added at month end. For whatever reason, a starting balance must be entered as a negative number, for example - =nper(0.01,-100,-500,1000,0) Will return 4.675, the number of months to get you from $500 to $1000 with a $100/mo deposit and 1%/mo return. Someone smarter than I (Chris Degnen comes to mind) can explain why the starting balance needs to be entered this way. But it does show the correct result. As confirmed by my TI BA-35 financial calculator, which doesn't need $500 to be negative. "Here's a formula;  I had to go over to SEMath, use their MathJax to compose the answer and then paste this screen shot. As a result, I can't fix a typo:  ""ST"" is the same as ""St""" Fairly straightforward to match the result from the calculator soup link.  There is a formula to calculate n from the future value s (using natural logs) In Excel This was derived as shown  To calculate n from the inflation-adjusted future value si requires using a solver since an algebraic formula cannot be formulated.  As demonstrated  Calculations done using Mathematica 7.
Also, unless I missed it and someone already mentioned it, do keep in mind the impact of these credit cards balances on your credit score. Over roughly 75% usage on a given credit account reflects badly on your score and has a pretty large impact on how your worthiness is calculated. It gives the impression that you are a person that lives month to month on cards, etc. If you could get both cards down to reasonable balances to where you could begin paying on them regularly and work them down over time, that will not only look incredible for your credit report but also immediately begin making your credit worthiness begin to raise due to the fact that you will not have accounts that (I'm assuming here) are at very high usage (over 75% of your total limit.) If you have to get one card knocked out just to get breathing room, and you're boxed in here -- or honestly even if the mental stress is causing you incredible hardship day to day, then I suppose blow one card out of the water, reassess and start getting to work on that second card. I hope this helped, I'm no expert, but I have had every kind of luck with credit cards and accounts you could think of, so I can only give my experience from the rubber-meets-the-road perspective. Good luck! It would be interesting to bridge the gap between scientists and practitioners.   That said, a daily cadence is way, way too lofty of a goal to start with. Even a weekly newsletter would be pushing it. Professors often have their own publications to deal with, whether it be their own social media, publishing in journals, reviewing/editing others' articles, teaching, etc. In other words, professors are very busy people, and there would be little to no incentive for them to spend their valuable time on an outlet that wouldn't benefit them in some way.   That said, start small. Reach out to business professors and see what the interest is like, what they would want out of it (if anything), what medium they would prefer (e.g., blog post, a tweet, podcast), and so forth.  As an example, check out the Oxford Review: https://www.oxford-review.com/ There are lots of sub-parts to your question. Let's takle them one at a time. Should I worry about an IRA at this age? Absolutely! Or at least some form of retirement account. When you are young is the BEST time to start putting money into a retirement account because you have so much time for it to grow. Compounding interest is a magical thing. Even if you can only afford to put a very small amount in the account, do it!  You will have to put a heck of a lot less money into the account over your working career if you start now. Is there a certain amount  you need for the IRA deduction? No. Essentially with a traditional IRA you can just subtract the amount you deposited (up to the contribution limit) from your income when calculating your taxes.  What kind of IRA should I get? I suggest a ROTH IRA, but be warned that with that kind you get the tax breaks when you retire, not now. If you think taxes will be higher in 40 years or so, then the Roth is a clear winner.  Traditional IRA: Tax deduction this year for contribution; investment   plus gains are taxed as income when   you take the money out at retirement. Roth IRA: Investment amount is taxed in the year you put it in; no   taxes on investment amount or gains   when you take it out at retirement. Given the long horizon that you will be investing, the money is likely going to at least double. So the total amount you are taxed on over your lifetime would probably be less with the ROTH even if tax rates remain the same. Is the 401K a better option? If they offer a match (most do) then it is a no-brainer, the employer 401K always comes out on top because they are basically paying you extra to put money into savings.  If there is no match, I suggest a Roth because company 401K plans usually have hidden fees that are much higher than you are going to pay for setting up your own IRA or Roth IRA with a broker. The amount of money you have should be enough for you to live a safe but somewhat restricted life if you never worked again - but it could set you up for just about any sort of financial goal (short of island buying) if you do just about any amount of work. The basic math for some financial rules of thumb to keep in mind: If your money is invested in very low-risk ways, such as a money market fund, you might earn, say, 3% in interest every year. That's $36k. But, if you withdraw that $36k every year, then every year you have the same principal amount invested. And a dollar tomorrow can't buy as much as a dollar today, because of inflation. If we assume for simplicity that inflation is 1% every year, then you need to contribute an additional $12k to your principal balance every year, just so that it has the same buying power next year. This leaves you with a net $24k of interest income that you can freely spend every year, for the rest of your life, without ever touching your principal balance. If your money is invested more broadly, including equity investments [stocks], you might earn, say, 7% every year. Some years you might lose money on your investments, and would need to draw down your principal balance to pay your bills. Some years you might do quite well - but would need to remain conservative and not withdraw your 'excess' earnings every year, because you will need that 'excess' to make up for the bad years. This would leave you with about $74k of income every year before inflation, and about $62k after inflation. But, you would be taking on more risk by doing this. If you work enough to pay your daily bills, and leave your investments alone to earn 7% on average annually, then in just 10 years your money would have doubled to ~ $2.4 Million dollars. This assumes that you never save another penny, and spend everything you make. It's a level of financial security that means you could retire at a drop of the hat. And if don't start working for 20 years [which you might need to do if you spend in excess of your means and your money dries up], then the same will not be true - starting work at 45 with no savings would put you at a much greater disadvantage for financial security. Every year that you work enough to pay your bills before 'retirement' could increase your nest egg by 7% [though again, there is risk here], but only if you do it now, while you have a nest egg to invest. Now in terms of what you should do with that money, you need to ask yourself: what are your financial goals? You should think about this long and hard (and renew that discussion with yourself periodically, as your goals will change over time). You say university isn't an option - but what other ways might you want to 'invest in yourself'? Would you want to go on 'sabbatical'-type learning trips? Take a trade or learn a skill? Start a business? Do you want to live in the same place for 30 years [and thus maybe you should lock-down your housing costs by buying a house] or do you want to travel around the world, never staying in the same place twice [in which case you will need to figure out how to live cheaply and flexibly, without signing unnecessary leases]. If you want to live in the middle of nowhere eating ramen noodles and watching tv, you could do that without lifting a finger ever again. But every other financial goal you might have should be factored into your budget and work plan. And because you do have such a large degree of financial security, you have a lot of options that could be very appealing - every low paying but desirable/hard-to-get job is open to you. You can pursue your interests, even if they barely pay minimum wage, and doing so may help you ease into your new life easier than simply retiring at such a young age [when most of your peers will be heavy into their careers]. So, that is my strongest piece of advice - work now, while you're young and have motivation, so that you can dial back later. This will be much easier than the other way around. As for where you should invest your money in, look on this site for investing questions, and ultimately with that amount of money - I suggest you hire a paid advisor, who works based on an hourly consultation fee, rather than a % management fee. They can give you much more directed advice than the internet (though you should learn it yourself as well, because that will give you the best piece of mind that you aren't being taken advantage of). you'll need 25k to start or 2k in multiple accounts, that way you have access to margin, and don't have to worry about Pattern day trading limits. Be right more than you are wrong. Go up look for 3x potential up vs down risk. Compound daily.  you can't double a penny every day every day for a month it becomes to difficult. but you can do 1%/day or maybe better. 2k compounded 1% every day becomes 75k at the end of a year (but you'll likely have to take weekends off, or look for other markets) "You've laid out a strategy for deciding that the top of the market has passed and then realizing some gains before the market drops too far.  Regardless of whether this strategy is good at accomplishing its goal, it cannot by itself maximize your long-term profits unless you have a similar strategy for deciding that the bottom of the market has passed.  Even if you sell at the perfect time at the top of the market, you can still lose lots of money by buying at the wrong time at the bottom. People have been trying to time the market like this for centuries, and on average it doesn't work out all that much better than just plopping some money into the market each week and letting it sit there for 40 years. So the real question is: what is your investment time horizon?  If you need your money a year from now, well then you shouldn't be in the stock market in the first place.  But if you have to have it in the market, then your plan sounds like a good one to protect yourself from losses. If you don't need your money until 20 years from now, though, then every time you get in and out of the market you're risking sacrificing all your previous ""smart"" gains with one mistimed trade.  Sure, just leaving your money in the market can be psychologically taxing (cf. 2008-2009), but I guarantee that (a) you'll eventually make it all back (cf. 2010-2014) and (b) you won't ""miss the top"" or ""miss the bottom"", since you're not doing any trading." "Re. question 2 If I buy 20 shares every year, how do I get proper IRR? ... (I would   have multiple purchase dates) Use the money-weighted return calculation: http://en.wikipedia.org/wiki/Rate_of_return#Internal_rate_of_return  where t is the fraction of the time period and Ct is the cash flow at that time period. For the treatment of dividends, if they are reinvested then there should not be an external cash flow for the dividend.  They are included in the final value and the return is termed ""total return"".  If the dividends are taken in cash, the return based on the final value is ""net return"". The money-weighted return for question 2, with reinvested dividends, can be found by solving for r, the rate for the whole 431 day period, in the NPV summation. Now annualising And in Excel" "This simulation game uses actual historical S&P 500 data to test whether you can ""time the market."" You start with $10,000 invested, and it plays back 10 years of index values, in which time you can choose to sell (once), and if you do sell you can subsequently buy (once). Then you find out how you did relative to just holding what you started with.  If you play it enough times, you might eventually beat it once. I never did."