We're hoping to do something similar this year, and are like yourselves with small kids and a not insignificant mortgage. We're bringing in good money, but I am very prone to serious overspending from time to time. We've also started the new year afresh. Some things that we are doing/have done. Go through your last 3 months bank statements and try to get a fix on your essential spending, ie. mortgage, childcare, food, utilities, travel, insurance. These are a given. Then allow yourselves some discretionary spending, maybe 30 per week, or some figure that you're comfortable with but on the understanding that once it's gone that it,you get nothing more til the following week.(bringing packed lunch to work and giving the coffee shops a miss means your money goes much further, allow a bought lunch once a week) After that put the balance into a savings account on pay day. If it's gone out of your current account, your much less likely to dip into it. For us most of our wasted spending is on grocery shopping, takeaways and diy shops. Now we allow ourselves a takeaway once a month (might have been 2-3 nights per week before, pure laziness really), we just don't go to the diy shops, and we don't go near the supermarket without a shopping list. Also when you do your food shopping make sure you don't go when you're hungry. You'd be amazed how much extra rubbish you buy when you're hungry. We do allow ourselves a couple of bottles of wine per week as we don't go out much, so some small luxuries are essential in my opinion. On paper you have a good surplus, so none of the above should be much of a struggle, it's just discipline (at least that's what I'm telling myself)