Does Degiro charge per order or per transaction?
An order is not a transaction.  It is a request to make a transaction.  If the transaction never occurs (e.g. because you cancel the order), then no fees should be charged. will I get the stamp duty back (the 0.5% tax I paid on the shares purchase) when I sell the shares? I'm not a UK tax expert, but accorging to this page is seems like you only pay stamp tax when you buy shares, and don't get it back when you sell (but may be responsible for capital gains taxes).  That makes sense, because there's always a buyer and a seller, so if you got the tax back when you sold, the tax would effectively be transferred from the buyer to the seller, and the government would never collect anything.
It comes down to liability - if a fraudulent transaction takes place with a debit card, you are out $$ until it is resolved - while as with a credit card, the credit lender is out $$ - the credit lender does not like losing $$, and therefore would like to be paid extra $$ for assuming this risk, and they found the merchant as the one most willing to pay. Sometimes the merchant will pass on this cost to the consumer, but often times the credit card company has a contract with the merchant preventing such a fee, because then they would be at a price disadvantage when compared to debit. I would presume this goes entirely through the credit card network rather than the banking network. I am guessing that it's essentially the same operation as if you had returned something purchased on a card to the store for credit, but I'm not sure whether it really looks like a vendor credit to the network or if it is marked as a different type of transaction. Reading the plan documentation, yes, that is what it means.  Each purchase by bank debit, whether one-time or automatic, costs $2 plus $0.06 per share; so if you invested $50, you would get slightly less than $48 in stock as a result (depending on the per-share price). Schedule of Fees Purchases – A one-time $15.00 enrollment fee to establish a new     account for a non-shareholder will be deducted from the     purchase amount. – Dividend reinvestment: The Hershey Company pays the     transaction fee and per share* fee on your behalf. – Each optional cash purchase by one-time online bank     debit will entail a transaction fee of $2.00 plus $0.06 per     share* purchased. – Each optional cash purchase by check will entail a     transaction fee of $5.00 plus $0.06 per share* purchased. – If funds are automatically deducted from your checking or     savings account, the transaction fee is $2.00 plus $0.06     per share* purchased. Funds will be withdrawn on the     10th of each month, or the preceding business day if the     10th is not a business day. – Fees will be deducted from the purchase amount. – Returned check and rejected ACH debit fee is $35.00. "Etiquette or not, it is hurting the seller. The transaction fees have usually minimums, so if the actual transaction is below the minimum - they'll pay larger fee on the transaction (relatively). As an example, assume minimum fee for a debit card swipe is 20 cents, or 2% of the transaction. For a transaction of $10 and above, the fee will be 2% of the transaction. But for $1.67, the fee becomes 12% of the transaction. 6 times more expensive for the seller. Basically, the sale was most likely at a loss for them (they usually have very low margins, especially for a ""dollar"" store). So take that into account as well." Is that really a surprise? Merchant fees are typically around 2-3% (article says 1-4%) of the transaction sometimes with per transaction fees too. However, if you are paying 4% get a new CC processor. I am paying 2.75% for swiped/chip transactions for almost no volume with Square (I don't sell much, have it for convenience just in case).  https://squareup.com/pricing  I would be willing to bet that the ratio of overdrafts compared to not overdrafts is very low. I know I can't use my visa debit card when there is no money in the bank, and really, how many people use checks anymore? In addition to paypal, Amazon also offers a payment processing service that has micropayment pricing: For Transactions < $10: They do. The $260 already accounts for fees, I just left that out as I didn't believe it necessary info for the question of how to solve for group B.   Edit : Oh, you mean accounting for the 1.5% interchange for group A? Yeah, I didn't do that. For group A we weren't given a number for monthly spend but we were told that they carry an average monthly balance of $3000. I think something you might want to look at is a service called Dwolla. They charge $0.25 per transaction, and are free for transactions under $10. When my orders fill, I'll often see a 1000 shares go through over 4-6 transactions, with a few cents difference high to low, but totaling the transaction cost, it adds to one commission (say $10 for my broker). Are you sure a series of partial fills would result in as many as 20 commissions? Most bank registers (where you write down entries) show deposits (+) to account as a CREDIT. Payments, fees, and withdrawals are DEBITs to your bank accounnt. On loans such as credit card accounts, a credit to your loan account is a payment or other reductions of the amount you owe. A charge to your account is a DEBIT to you loan account. They did this just to confuse us! "Not every American credit card charges Foreign Currency conversion fees. I won't mention the specific one I know about as I'm not interested in shilling for them. However, if you Google ""No foreign transaction fee"" you will find a couple of options." "I am not familiar with this broker, but I believe this is what is going on: When entering combination orders (in this case the purchase of stocks and the writing of a call), it does not make sense to set a limit price on the two ""legs"" of the order separately. In that case it may be possible that one order gets executed, but the other not, for example. Instead you can specify the total amount you are willing to pay (net debit) or receive (net credit) per item. For this particular choice of a ""buy and write"" strategy, a net credit does not make sense as JoeTaxpayer has explained. Hence if you would choose this option, the order would never get executed. For some combinations of options it does make sense however. It is perhaps also good to see where the max gain numbers come from. In the first case, the gain would be maximal if the stock rises to the strike of the call or higher. In that case you would be payed out $2,50 * 100 = $250, but you have paid $1,41*100 for the combination, hence this leaves a profit of $109 (disregarding transaction fees). In the other case you would have been paid $1,41 for the position. Hence in that case the total profit would be ($1,41+$2,50)*100 = $391. But as said, such an order would not be executed. By the way, note that in your screenshot the bid is at 0, so writing a call would not earn you anything at all." "An order is your command to the broker to, say, ""sell 100 shares of AAPL"". An executed order (or partially executed order) is when all (or some) of that command is successfully completed. A transaction is an actual exchange of shares for money, and there may be one or more transactions per executed order.  For example, the broker might perform all of the following 5 transactions in order to do what you asked: On the other hand, if the broker cannot execute your order, then 0 transactions have taken place. The fee schedule you quote is saying that no matter how many transactions the broker has to perform in order to fill your order -- and no matter what the share prices are -- they're only going to charge you $0.005 per share ($0.50 in this example of 100 shares), subject to certain limits. However, as it says at the top of the page you linked, Our Fixed pricing for stocks, ETFs (Exchange Traded Products, or ETPs) and warrants charges a fixed amount per share or a set percent of trade value, and includes all IB commissions, exchange and most regulatory fees with the exception of the transaction fees, which are passed through on all stock sales. certain transaction fees are passed through to the client.  The transaction fee you included above is the SEC fee on sales.  Many (but not all) transaction fees DO depend on the prices of the shares involved; as a result they cannot be called ""fixed"" fees. For example, if you sell 100 shares of AAPL at $150 each, But if you sell 100 shares of AMZN at $940 each, So the broker will charge you the same $0.50 on either of those orders, but the SEC will charge you more for the expensive AMZN shares than for the cheaper AAPL shares. The reason this specific SEC fee mentions aggregate sales rather than trade value is because this particular SEC fee applies only to the seller and not to the buyer.  So they could have written aggregate trade value, but they probably wanted to highlight to the reader that the fee is only charged on sells." With a paypal micropayment he pays 61k (6.1%) (5% of sale price + .05 cents per transaction)  With a regular paypal he pays 95k (9.5%) (2.9% of sale price + .30 cents per transaction)  In case anybody was wondering what the poster is talking about.  Either way he got hosed by using PayPal.   Note: I'm working off 220,000 units sold at 1 million dollars (which I know aren't the exact figures). A debit card takes the funds right from your account. There's no 'credit' issued along the way. The credit card facilitates a short term loan. If you are a pay-in-full customer, as I am, there's a cost to lend the money, but we're not paying it. It's part of the fee charged to the merchant. Thus the higher transaction cost.