The offer, which covers sales valued at $5,000-$500,000 (£3,500-£350,000), applies to orders that are shipped through 31 December and installed by 31 January.
The no-finance-charge offer, which can also include ThinkPad laptops, IntelliStation and NetVista workstations and peripherals, must be done through IBM or one of its authorised business partners in the US. Equipment can be financed over a maximum of 24 months.
Bill Doscas, vice-president of IBM's global sales and marketing, said that despite tight economic times for many companies, some customers are "still looking to invest in technologies, and this is a way for them to do it".
This is the first time IBM has offered zero percent financing on xSeries servers in the US, he said. "These financial offerings help IBM and help our customers deploy technology faster," he said.
IBM and Compaq offered other financing sweeteners last month. IBM allowed 90-day payment deferrals and interest rates as low as 5.1%, depending on the hardware, software or services being purchased. Compaq offered payment deferrals for four months.
IBM is yet to announce a zero percent finance programme for the UK.