Credit card grace period for pay, wait 1 day, charge?
You shouldn't be charged interest, unless possibly because your purchases involve a currency conversion. I've made normal purchases that happened to involve changes in currency.  The prices were quoted in US$ to me.  On the tail end, though, the currency change was treated as a cash advance, which accrues interest immediately. "If I understand you correctly, no you shouldn't be charged interest. Lets say you have a billing cycle of monthly (which usually isn't true). You charge $XX per day, ending up at $1000 at the end of January. So February 1st, your bill for your January billing cycle is $1000, due by Feb 15th (lets say). On February 1st, you continue to charge $XX per day. You go to pay your bill online on Feb 14th (to be safe), and you'll usually see on your credit card website something like: You'd hit ""Pay my bill"", and you'd usually see these options: At the date your cycle was due (Feb 15th), if you haven't paid your full latest statement (lets say you paid $500), they will charge you interest on the entire balance for the period (so interest on $1000, or lets say $50). The other $500 will roll over to the next month, so your next month you'd be somewhere near a $1550 bill." This will not result in any finance charges: I wouldn't recommend cutting it quite so close, but as long as you pay the full balance as shown on each statement by the due date shown on that same statement, you won't incur a finance charge. Of course this only applies in the case of ordinary purchases that have a grace period.
Remember, carrying debt on a credit card and waiting to pay it is increased risk in the event something happens and you can't pay it off. I have 1 CC and I have it set to auto-pay on the day it's due (paid in full each month as I don't carry debt anymore - learned that lesson a hard way :) ). So the day it's due it auto-drafts out of my checking. No worries of late payments, missed payments, etc. If you feel that having any balance is bad then by all means pay it off the minute you get your statement. It should come at the same time each month (or close to the same time) and you should be able to setup an auto-payment to pay it off in full as soon as the new statement goes live. To be honest, those extra few days of supposed interest saved by keeping the money in your checking account is so minimal that's it's probably not worth it. Most checking is horrible in interest (all my 'high interest' checking accounts are now less than 1% APR. boo.) and if you're late 1 day then bam! All that earned interest is gone in 1 late fee... I don't know of any that are comparable to credit cards. There's a reason for that. Debit cards, being newer, have a much lower interchange rate. Since collecting on debt is risky and less predictable, rewards / miles are paid from those interchange fees. This means with a debit card there's less money to pay you with. So what can you do? Assuming your credit isn't terrible, you can just open a credit card account and pay in full for purchases by the grace period. I don't know how all cards work, but my grace period allows me to pay in full by the billing date (roughly a month from purchase) and incur no finance charges. In effect, I get a small 30 day loan with no interest, and a cash back incentive (I dislike miles). You're also less liable for fraud via CC than debit. There are a few factors at play here. Depending on the bank that has offered you the card there are different types of overdraft protection that may have been set up. Typically, if they attempt to run the card with no money, if one of these is in play, you will be spared any overdraft fees by the transaction charging to a designated overdraft account, usually savings, or by the transaction failing due to insufficient funds.  If you know the transaction went through, and you know there were not enough funds in the account to cover the transactions, then you have a few options. If you have overdraft protection that auto charges insufficient funds charges to a separate account, then you have nothing to worry about. If you do not, most banks offer a grace period where you have until the end of the day to zero out your account, that is to say pay the overdraft amount and bring your balance to at least $0.  If this is a charge that occurred in the past, and you have already been charged an overdraft fee, there may still be hope. I cannot speak for all banks, but I know that Chase Bank offers a once per year overdraft forgiveness, where they will get rid of the charges if you agree to bring the account out of the negative. There is a chance other banks will do the same if you call their customer service. Keeping a receipt does allow you to verify that the expected amount was charged/debited it also can help when you need to return an item.  Regarding double charging, the credit card companies look for that. If the same card is used at the same vendor for the same exact amount in a short period of time the credit card company will flag the transaction. They assume either a mistake was made, or fraud is being attempted. The most likely result is that the transaction is denied.  A dishonest vendor can write down the card number, expiration date and CVV number. Then after you leave make up a new transaction for any amount they want. You of course wouldn't have a paper receipt for this fraudulent transaction. The key is reviewing your transaction history every few days: looking for unexpected amounts, locations, or number of transactions. It is COMPLETELY no use to pay earlier (during a billing cycle) to better your credit score! Your credit score gets affected ONLY once a month from each creditor, and that happens when they post your monthly statement. Thus, no matter what you do or pay and how many times a month or how many days earlier than your due date, it has NO EFFECT WHATSOEVER on your score. Anything you do will be reflected only after the statement. What you pay in between those two statements is irrelevant. So, as far as credit score goes IT DOESN'T MATTER. However, if you want to save on interest being charged, it is wise to pay as early as possible, so your balance is as low as possible for day-by-day calculation of your interest. "From my days in e-commerce they break down like this? The company doesn't know a debit from a credit card.  Got the Visa logo, then it is a Visa through the company's payment gateway.  The gateway talks to the bank and that is where the particulars for money is figured out. When I programmed gateway interfaces, I had the option to ""authorize"" or check for funds (which didn't reserve anything, just verified funds existed), run for batch (which put a hold on the funds and collected them at the end of the night) or just take the money. Most places did a verify during the early checkout stages and then did a batch at the end of the night.  The nightly batch allows a merchant to cancel a transaction without getting charged a fee. The ""authorize"" doesn't mean the money is tied up, although that might be your banks policy.  Furthermore, an authorize can only last for so many days.  This also explains why most of your banks don't report your transactions to you the day of.  There is a bunch more activity on your card than the transactions that complete." "In the US, if your monthly statement was issued by the credit card company on January 1 and it showed a balance of $1000, then a payment must be made towards that balance by January 25 or so, not February 1 as you say, to keep the card in good standing. The minimum payment required to keep the card in good standing is specified in your monthly statement, and failure to meet this requirement can trigger various consequences such as an increase in the interest rate charged by the credit card company. With regard to interest charges, whether your purchase of $2000 on  January 3 is charged interest or not depends entirely on what happened the previous two months.  If you had paid both your monthly statements dated November 1 and December 1 of the previous year in full by the their respective due dates of November 25 and December 25, and the $1000 balance on the January 1 statement is entirely due to purchases (no cash advances) made in December, then you will not be charged interest on your January purchase of $2000 as long as you pay it off in full by February 25 (the charge will appear on your February 1 statement). But, if you had not paid your December 1 statement in full by December 25, then that $1000 billed to you on January 1 will include  purchases made during December finance charges on the unpaid balance from the previous month  plus finance charges on the purchases made during December. The finance charges will continue to accumulate during January until such time as you pay off the bill in full (these charges will appear on your February 1 statement), hopefully by the due date of January 25. But even if you pay off that $1000 in full on January 25, your charge of $2000 on January 3 will start to accumulate finance charges as of the day it hits the account and these finance charges will appear on your February 1 statement.  If you paid off that $1000 on January 10, say, then maybe there will be no further finance charges on the $2000 purchase on January 3 after January 10 but now we are getting into the real fine print of what your credit card agreement says. Ditto for the case when you pay off that $1000 on January 2 and made the $2000 charge on January 3. You most likely will not be charged interest on that $2000 charge but again it depends on the fine print. For example, it might say that you will be charged interest on the average of the daily balances for January, but will not be charged interest on purchases during the February cycle (unless you miss the February 25 payment and the whole cycle starts all over again). As a general rule, it takes two monthly cycles of payment in full by the due date before one gets into the state of no finance charges for new purchases and effectively an ""interest-free"" loan of $2000 from January 3 (date of purchase) till February 25 (due date of payment).  Matters become more complicated when cash advances are taken from a credit card which are charged interest from the day they are taken but don't trigger finance charges on new purchases or the so-called ""zero percent balance transfer offers"" are accepted." It depends on the bank and network. Banks are to provide outgoing data at the certain time for the processing by the central clearing house (the Federal Reserve system, for ACH), which then distributes incoming data back to the banks. All this has to be done between the closing of the business day and the opening of the next one. If the transaction hasn't completed the full path during that time - it will wait at the position it was stuck at until the next cycle - next night. That's why sometimes ACH transactions take more than 1 day to complete (if, for example, multiple Fed banks have to be involved).