Following is a link for all EB-Tax related tables:
http://oracleappscommunity.com/oracle/blog/1181/e-business-tax-tables
I found another useful query at Oracle Apps Knowledge Sharing website, which I have updated for my own requirement.
http://www.shareoracleapps.com/2013/04/e-business-tax-query-taxrate-based-on-operating-unit-r12-oracleapps.html
SELECT hou.organization_id org_id,
led.name ledger,
hou.name operating_unit,
--
zxr.tax_regime_code tax_regime_code,
zxr.tax tax_code,
zxr.tax_status_code tax_status_code,
zxr.tax_rate_code tax_rate_code,
zxr.tax_jurisdiction_code
tax_jurisdiction_code,
--
zxr.rate_type_code rate_type_code,
zxr.percentage_rate percentage_rate,
zxr.effective_from rate_effective_from,
zxr.effective_to rate_effective_to,
--
acc.tax_account_ccid tax_account_ccid,
gcc.concatenated_segments
tax_account
FROM
zx_rates_vl zxr,
zx_accounts acc,
hr_operating_units hou,
gl_ledgers led,
xxrl_gl_code_combinations_v gcc
WHERE
1=1
--
-- AND zxr.tax_regime_code = 'UK VAT'
-- AND zxr.tax_rate_code = 'UK_AR_DOM'
--
AND acc.tax_account_entity_code =
'RATES'
AND zxr.active_flag = 'Y'
AND TRUNC (SYSDATE) BETWEEN
TRUNC
(zxr.effective_from) AND
NVL (TRUNC
(zxr.effective_to), TRUNC (SYSDATE) + 1)
--
AND led.ledger_id =
hou.set_of_books_id
AND gcc.code_combination_id =
acc.tax_account_ccid
AND hou.organization_id =
acc.internal_organization_id
AND acc.tax_account_entity_id =
zxr.tax_rate_id
--
;