bhge 2018 form 10-k | 41 estimate would equal up to 5% ( 5 % ) of annual revenue .the expenditures are expected to be used primarily for normal , recurring items necessary to support our business .we also anticipate making income tax payments in the range of $ 425 million to $ 475 million in 2019 .contractual obligations in the table below , we set forth our contractual obligations as of december 31 , 2018 .certain amounts included in this table are based on our estimates and assumptions about these obligations , including their duration , anticipated actions by third parties and other factors .the contractual obligations we will actually pay in future periods may vary from those reflected in the table because the estimates and assumptions are subjective. .
[['( in millions )', 'payments due by period total', 'payments due by period less than1 year', 'payments due by period 1 - 3years', 'payments due by period 4 - 5years', 'payments due by period more than5 years'], ['total debt and capital lease obligations ( 1 )', '$ 6989', '$ 942', '$ 562', '$ 1272', '$ 4213'], ['estimated interest payments ( 2 )', '3716', '239', '473', '404', '2600'], ['operating leases ( 3 )', '846', '186', '262', '132', '266'], ['purchase obligations ( 4 )', '1507', '1388', '86', '25', '8'], ['total', '$ 13058', '$ 2755', '$ 1383', '$ 1833', '$ 7087']]
( 1 ) amounts represent the expected cash payments for the principal amounts related to our debt , including capital lease obligations .amounts for debt do not include any deferred issuance costs or unamortized discounts or premiums including step up in the value of the debt on the acquisition of baker hughes .expected cash payments for interest are excluded from these amounts .total debt and capital lease obligations includes $ 896 million payable to ge and its affiliates .as there is no fixed payment schedule on the amount payable to ge and its affiliates we have classified it as payable in less than one year .( 2 ) amounts represent the expected cash payments for interest on our long-term debt and capital lease obligations .( 3 ) amounts represent the future minimum payments under noncancelable operating leases with initial or remaining terms of one year or more .we enter into operating leases , some of which include renewal options , however , we have excluded renewal options from the table above unless it is anticipated that we will exercise such renewals .( 4 ) purchase obligations include expenditures for capital assets for 2019 as well as agreements to purchase goods or services that are enforceable and legally binding and that specify all significant terms , including : fixed or minimum quantities to be purchased ; fixed , minimum or variable price provisions ; and the approximate timing of the transaction .due to the uncertainty with respect to the timing of potential future cash outflows associated with our uncertain tax positions , we are unable to make reasonable estimates of the period of cash settlement , if any , to the respective taxing authorities .therefore , $ 597 million in uncertain tax positions , including interest and penalties , have been excluded from the contractual obligations table above .see "note 12 .income taxes" of the notes to consolidated and combined financial statements in item 8 herein for further information .we have certain defined benefit pension and other post-retirement benefit plans covering certain of our u.s .and international employees .during 2018 , we made contributions and paid direct benefits of approximately $ 72 million in connection with those plans , and we anticipate funding approximately $ 41 million during 2019 .amounts for pension funding obligations are based on assumptions that are subject to change , therefore , we are currently not able to reasonably estimate our contribution figures after 2019 .see "note 11 .employee benefit plans" of the notes to consolidated and combined financial statements in item 8 herein for further information .off-balance sheet arrangements in the normal course of business with customers , vendors and others , we have entered into off-balance sheet arrangements , such as surety bonds for performance , letters of credit and other bank issued guarantees , which totaled approximately $ 3.6 billion at december 31 , 2018 .it is not practicable to estimate the fair value of these financial instruments .none of the off-balance sheet arrangements either has , or is likely to have , a material effect on our consolidated and combined financial statements. .

Question: what are the combined total operating leases and purchase obligations as a percentage of the total payments due?
Answer: 18.0%