The salary for JET participants is approximately 3,600,000 yen per annum after Japanese incomes and resident's taxes are deducted. In general, your monthly income should be somewhere between 250,000 to 280,000 yen depending on your situation.
From there, here is a typical budget:
| Expenses | Average Price / month (yen) |
|---|---|
| Rent | 20,000 |
| Water | 1,500 |
| Electricity | 5,500 (+ if air conditioning) |
| Gas | 3,000 |
| Telephone | 7,000 |
| Mobile Phone | 4,000 |
The biggest variables are rent, transportation, and...beer. Other expenses include long distance calls, internet connection, and cable/antenna TV. One more important variable to consider is that if you rely on an aircon for your heating and cooling, you will likely spend a great deal more on electricity with spikes in the hottest parts of the summer and coldest parts of the winter.
Traveling is also expensive, especially within Japan. Plan long in advance and avoid peak seasons.
Remember to put some money on the side for unexpected enkais (5,000 yen each on average), a speeding ticket (10,000 - 50,000 yen), or the NHK collectors (2,000 yen per month). You should be able to live on 100,000 yen a month with plenty of opportunity to have fun, saving about 50,000 to 100,000 yen a month.
Currency ExchangeDon't play the currency exchange market - sometimes you will reap the benefit of a good rate, but the reverse can also apply. Send money home at the same time every month and take advantage of the averaging effect. For accurate rates, you can visit XE.com.
Tips and TricksOn payday go straight to the post office and send money home. Do it straight away or you will invariably spend your intended savings. Once you are used to surviving on 'pay minus savings' you will find it easy to do, but get in the habit of spending all your pay each month and it will be a hard habit to break.
Use DiscretionDon't Forget to Enjoy Life
By all means save money, but be careful not to make yourself miserable in the process by depriving yourself of a real life. It is entirely possible to have a social life, experience Japanese culture and save money - you don't have to spend the whole year in your apartment.