mookie, regarding the tax side I guess it depends if you are classed as a trader by the tax office. If so and they take your CFD profits as taxable income I would imagine interest costs would be an allowable deduction. Best check first with your accountant to make sure you are classed as a trader. I'm no expert but even if you hold CFDs for longer than 12 months I would imagine any profits would be regarded as current income, not capital gains. Once again, your accountant would know best.