Taxes and fees on Straight Talk refills will depend on where and how you buy it. If you purchase online directly through Straight Talk (or sign up for auto-refill) you will be charged your state's sales tax, and possibly some regulatory or 911 fees. It seems to vary by state, but I've seen reports of anywhere from $1 to $5 additional, on top of the actual refill cost. On the other hand, you can buy refill cards at Walmart stores (or on the Walmart web site) and you will only be charged whatever the sales tax is in the state where you buy it. No other fees. Since buying the refills online through Walmart just results in an email containing the activation code (nothing is actually physically shipped to you) some people have discovered that they can provide a shipping address in a sales-tax-free state (like NH or Oregon) regardless of where they actually live, and not be charged sales tax at all. I can't really recommend this, since it's legally questionable, but it has worked for some people.
If you buy the 3- or 6-month refills the rate ends up being cheaper, too. The
3-month card is $126 on Walmart.com ($42 per month). This is the card I purchase, and I do pay sales tax on it (Massachusetts, 6.25%) so my total cost for 3 months is $133.86, or $44.62 per month.