There are the obvious costs most retirees can predict, such as continued basic life expenses, or some they will even look forward to, like the expense of additional travel and time spent on hobbies. Then there are costs that retirees often end up overlooking when they are meting out their retirement account balance. Here are some of the most common hidden costs to look out for. Out-of-pocket healthcare costsMost retirees are aware that healthcare costs are a reality of aging. InflationWhile you may hear a lot about inflation on the news, “retirees routinely cite inflation as one of the most surprising ongoing costs in retirement,” said Kiplinger.