The tax amounted to 4.2 percent of gross wages as of the time of publication, while employers kicked in another 6.2 percent. If you are self-employed, you paid both employee and employer share through self-employment taxes. If you received royalty income, then you may have to add it to income taxable for Social Security benefits. It all depends on what kind of royalty income you earn.
10.7 Unless paragraph 1.2 of Practice Direction 45 (Fixed Costs in Small Claims) applies or unless the court orders otherwise, the fixed costs to be included in a default costs certificate are Â£80 plus a sum equal to any appropriate court fee payable on the issue of the certificate.
Alex provided a good estimate of $30-40 per month. So, to answer your question of how much it costs, there are a couple of considerations. First, there are the upfront costs, which as Alex said, can be as little as $100 for ADT and go up from there. Then, there are the recurring costs that are charged monthly. If you consider that you will be forced to sign (most common) a 3 year contract, then $30/mo. x 36 months = $1080 + your installation costs.